Finding the Fourth Proportional to 1,108.72, 1,658.60 and 926.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.72 : 1,658.60 = 926.48 : x
2. Step 2: Convert to fraction form
   1,108.72/1,658.60 = 926.48/x
3. Step 3: Cross multiply
   1,108.72x = 1,658.60 × 926.48
4. Step 4: Simplify right side
   1,108.72x = 1,536,659.73
5. Step 5: Solve for x
   x = 1,536,659.73/1,108.72
6. Step 6: Final answer
   x = 1,385.98