Finding the Fourth Proportional to 1,066.28, 1,471.47 and 624.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.28 : 1,471.47 = 624.09 : x
2. Step 2: Convert to fraction form
   1,066.28/1,471.47 = 624.09/x
3. Step 3: Cross multiply
   1,066.28x = 1,471.47 × 624.09
4. Step 4: Simplify right side
   1,066.28x = 918,329.71
5. Step 5: Solve for x
   x = 918,329.71/1,066.28
6. Step 6: Final answer
   x = 861.25