Finding the Fourth Proportional to 705,112.48, 973,078.50 and 399,182.61

Step by Step Solution

1. Step 1: Write the proportion equation
   705,112.48 : 973,078.50 = 399,182.61 : x
2. Step 2: Convert to fraction form
   705,112.48/973,078.50 = 399,182.61/x
3. Step 3: Cross multiply
   705,112.48x = 973,078.50 × 399,182.61
4. Step 4: Simplify right side
   705,112.48x = 388,436,020,510.86
5. Step 5: Solve for x
   x = 388,436,020,510.86/705,112.48
6. Step 6: Final answer
   x = 550,885.19