Finding the Fourth Proportional to 1,061.57, 1,464.01 and 688.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.57 : 1,464.01 = 688.18 : x
2. Step 2: Convert to fraction form
   1,061.57/1,464.01 = 688.18/x
3. Step 3: Cross multiply
   1,061.57x = 1,464.01 × 688.18
4. Step 4: Simplify right side
   1,061.57x = 1,007,502.40
5. Step 5: Solve for x
   x = 1,007,502.40/1,061.57
6. Step 6: Final answer
   x = 949.07