Finding the Fourth Proportional to 915,128.30, 1,262,952.69 and 507,358.10

Step by Step Solution

1. Step 1: Write the proportion equation
   915,128.30 : 1,262,952.69 = 507,358.10 : x
2. Step 2: Convert to fraction form
   915,128.30/1,262,952.69 = 507,358.10/x
3. Step 3: Cross multiply
   915,128.30x = 1,262,952.69 × 507,358.10
4. Step 4: Simplify right side
   915,128.30x = 640,769,277,188.29
5. Step 5: Solve for x
   x = 640,769,277,188.29/915,128.30
6. Step 6: Final answer
   x = 700,196.11