Finding the Fourth Proportional to 1,101.31, 1,642.67 and 937.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.31 : 1,642.67 = 937.15 : x
2. Step 2: Convert to fraction form
   1,101.31/1,642.67 = 937.15/x
3. Step 3: Cross multiply
   1,101.31x = 1,642.67 × 937.15
4. Step 4: Simplify right side
   1,101.31x = 1,539,428.19
5. Step 5: Solve for x
   x = 1,539,428.19/1,101.31
6. Step 6: Final answer
   x = 1,397.82