Finding the Fourth Proportional to 1,108.55, 1,663.48 and 615.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.55 : 1,663.48 = 615.38 : x
2. Step 2: Convert to fraction form
   1,108.55/1,663.48 = 615.38/x
3. Step 3: Cross multiply
   1,108.55x = 1,663.48 × 615.38
4. Step 4: Simplify right side
   1,108.55x = 1,023,661.31
5. Step 5: Solve for x
   x = 1,023,661.31/1,108.55
6. Step 6: Final answer
   x = 923.42