Finding the Fourth Proportional to 1,066.72, 1,471.92 and 624.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.72 : 1,471.92 = 624.16 : x
2. Step 2: Convert to fraction form
   1,066.72/1,471.92 = 624.16/x
3. Step 3: Cross multiply
   1,066.72x = 1,471.92 × 624.16
4. Step 4: Simplify right side
   1,066.72x = 918,713.59
5. Step 5: Solve for x
   x = 918,713.59/1,066.72
6. Step 6: Final answer
   x = 861.25