Finding the Fourth Proportional to 858,200.10, 1,287,300.15 and 659,523.30

Step by Step Solution

1. Step 1: Write the proportion equation
   858,200.10 : 1,287,300.15 = 659,523.30 : x
2. Step 2: Convert to fraction form
   858,200.10/1,287,300.15 = 659,523.30/x
3. Step 3: Cross multiply
   858,200.10x = 1,287,300.15 × 659,523.30
4. Step 4: Simplify right side
   858,200.10x = 849,004,443,018.50
5. Step 5: Solve for x
   x = 849,004,443,018.50/858,200.10
6. Step 6: Final answer
   x = 989,284.95