Finding the Fourth Proportional to 1,036.16, 1,553.85 and 645.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.16 : 1,553.85 = 645.59 : x
2. Step 2: Convert to fraction form
   1,036.16/1,553.85 = 645.59/x
3. Step 3: Cross multiply
   1,036.16x = 1,553.85 × 645.59
4. Step 4: Simplify right side
   1,036.16x = 1,003,150.02
5. Step 5: Solve for x
   x = 1,003,150.02/1,036.16
6. Step 6: Final answer
   x = 968.14