Finding the Fourth Proportional to 1,066.40, 1,471.50 and 624.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.40 : 1,471.50 = 624.18 : x
2. Step 2: Convert to fraction form
   1,066.40/1,471.50 = 624.18/x
3. Step 3: Cross multiply
   1,066.40x = 1,471.50 × 624.18
4. Step 4: Simplify right side
   1,066.40x = 918,480.87
5. Step 5: Solve for x
   x = 918,480.87/1,066.40
6. Step 6: Final answer
   x = 861.30