Finding the Fourth Proportional to 1,101.72, 1,520.88 and 653.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.72 : 1,520.88 = 653.56 : x
2. Step 2: Convert to fraction form
   1,101.72/1,520.88 = 653.56/x
3. Step 3: Cross multiply
   1,101.72x = 1,520.88 × 653.56
4. Step 4: Simplify right side
   1,101.72x = 993,986.33
5. Step 5: Solve for x
   x = 993,986.33/1,101.72
6. Step 6: Final answer
   x = 902.21