Finding the Fourth Proportional to 705,396,978.67, 1,058,508,065.86 and 263,045,258.42

Step by Step Solution

1. Step 1: Write the proportion equation
   705,396,978.67 : 1,058,508,065.86 = 263,045,258.42 : x
2. Step 2: Convert to fraction form
   705,396,978.67/1,058,508,065.86 = 263,045,258.42/x
3. Step 3: Cross multiply
   705,396,978.67x = 1,058,508,065.86 × 263,045,258.42
4. Step 4: Simplify right side
   705,396,978.67x = 278,435,527,723,798,080
5. Step 5: Solve for x
   x = 278,435,527,723,798,080/705,396,978.67
6. Step 6: Final answer
   x = 394,721,746.96