Finding the Fourth Proportional to 1,015,983.39, 1,402,072.83 and 557,139.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015,983.39 : 1,402,072.83 = 557,139.86 : x
2. Step 2: Convert to fraction form
   1,015,983.39/1,402,072.83 = 557,139.86/x
3. Step 3: Cross multiply
   1,015,983.39x = 1,402,072.83 × 557,139.86
4. Step 4: Simplify right side
   1,015,983.39x = 781,150,653,205.64
5. Step 5: Solve for x
   x = 781,150,653,205.64/1,015,983.39
6. Step 6: Final answer
   x = 768,861.64