Finding the Fourth Proportional to 1,102.41, 1,520.78 and 660.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,102.41 : 1,520.78 = 660.15 : x
2. Step 2: Convert to fraction form
   1,102.41/1,520.78 = 660.15/x
3. Step 3: Cross multiply
   1,102.41x = 1,520.78 × 660.15
4. Step 4: Simplify right side
   1,102.41x = 1,003,939.62
5. Step 5: Solve for x
   x = 1,003,939.62/1,102.41
6. Step 6: Final answer
   x = 910.68