Finding the Fourth Proportional to 898,978.91, 1,240,628.60 and 517,005.99

Step by Step Solution

1. Step 1: Write the proportion equation
   898,978.91 : 1,240,628.60 = 517,005.99 : x
2. Step 2: Convert to fraction form
   898,978.91/1,240,628.60 = 517,005.99/x
3. Step 3: Cross multiply
   898,978.91x = 1,240,628.60 × 517,005.99
4. Step 4: Simplify right side
   898,978.91x = 641,412,418,857.83
5. Step 5: Solve for x
   x = 641,412,418,857.83/898,978.91
6. Step 6: Final answer
   x = 713,489.96