Finding the Fourth Proportional to 1,648.72, 2,472.12 and 621.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.72 : 2,472.12 = 621.52 : x
2. Step 2: Convert to fraction form
   1,648.72/2,472.12 = 621.52/x
3. Step 3: Cross multiply
   1,648.72x = 2,472.12 × 621.52
4. Step 4: Simplify right side
   1,648.72x = 1,536,472.02
5. Step 5: Solve for x
   x = 1,536,472.02/1,648.72
6. Step 6: Final answer
   x = 931.92