Finding the Fourth Proportional to 1,003.17, 1,385.12 and 649.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.17 : 1,385.12 = 649.30 : x
2. Step 2: Convert to fraction form
   1,003.17/1,385.12 = 649.30/x
3. Step 3: Cross multiply
   1,003.17x = 1,385.12 × 649.30
4. Step 4: Simplify right side
   1,003.17x = 899,358.42
5. Step 5: Solve for x
   x = 899,358.42/1,003.17
6. Step 6: Final answer
   x = 896.52