Finding the Fourth Proportional to 1,109.52, 1,531.17 and 637.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.52 : 1,531.17 = 637.34 : x
2. Step 2: Convert to fraction form
   1,109.52/1,531.17 = 637.34/x
3. Step 3: Cross multiply
   1,109.52x = 1,531.17 × 637.34
4. Step 4: Simplify right side
   1,109.52x = 975,875.89
5. Step 5: Solve for x
   x = 975,875.89/1,109.52
6. Step 6: Final answer
   x = 879.55