Finding the Fourth Proportional to 1,066.78, 1,472.16 and 624.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.78 : 1,472.16 = 624.94 : x
2. Step 2: Convert to fraction form
   1,066.78/1,472.16 = 624.94/x
3. Step 3: Cross multiply
   1,066.78x = 1,472.16 × 624.94
4. Step 4: Simplify right side
   1,066.78x = 920,011.67
5. Step 5: Solve for x
   x = 920,011.67/1,066.78
6. Step 6: Final answer
   x = 862.42