Finding the Fourth Proportional to 1,066.56, 1,471.35 and 624.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.56 : 1,471.35 = 624.20 : x
2. Step 2: Convert to fraction form
   1,066.56/1,471.35 = 624.20/x
3. Step 3: Cross multiply
   1,066.56x = 1,471.35 × 624.20
4. Step 4: Simplify right side
   1,066.56x = 918,409.31
5. Step 5: Solve for x
   x = 918,409.31/1,066.56
6. Step 6: Final answer
   x = 861.09