Finding the Fourth Proportional to 617,899.30, 862,959.50 and 617,899.30

Step by Step Solution

1. Step 1: Write the proportion equation
   617,899.30 : 862,959.50 = 617,899.30 : x
2. Step 2: Convert to fraction form
   617,899.30/862,959.50 = 617,899.30/x
3. Step 3: Cross multiply
   617,899.30x = 862,959.50 × 617,899.30
4. Step 4: Simplify right side
   617,899.30x = 533,222,070,978.35
5. Step 5: Solve for x
   x = 533,222,070,978.35/617,899.30
6. Step 6: Final answer
   x = 862,959.50