Finding the Fourth Proportional to 1,057,389.96, 1,586,395.98 and 425,978.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057,389.96 : 1,586,395.98 = 425,978.76 : x
2. Step 2: Convert to fraction form
   1,057,389.96/1,586,395.98 = 425,978.76/x
3. Step 3: Cross multiply
   1,057,389.96x = 1,586,395.98 × 425,978.76
4. Step 4: Simplify right side
   1,057,389.96x = 675,770,992,429.39
5. Step 5: Solve for x
   x = 675,770,992,429.39/1,057,389.96
6. Step 6: Final answer
   x = 639,093.45