Finding the Fourth Proportional to 1,102.58, 1,521.58 and 660.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,102.58 : 1,521.58 = 660.50 : x
2. Step 2: Convert to fraction form
   1,102.58/1,521.58 = 660.50/x
3. Step 3: Cross multiply
   1,102.58x = 1,521.58 × 660.50
4. Step 4: Simplify right side
   1,102.58x = 1,005,003.59
5. Step 5: Solve for x
   x = 1,005,003.59/1,102.58
6. Step 6: Final answer
   x = 911.50