Finding the Fourth Proportional to 1,036.10, 1,553.32 and 646.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.10 : 1,553.32 = 646.20 : x
2. Step 2: Convert to fraction form
   1,036.10/1,553.32 = 646.20/x
3. Step 3: Cross multiply
   1,036.10x = 1,553.32 × 646.20
4. Step 4: Simplify right side
   1,036.10x = 1,003,755.38
5. Step 5: Solve for x
   x = 1,003,755.38/1,036.10
6. Step 6: Final answer
   x = 968.78