Finding the Fourth Proportional to 1,111.13, 1,531.80 and 756.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.13 : 1,531.80 = 756.50 : x
2. Step 2: Convert to fraction form
   1,111.13/1,531.80 = 756.50/x
3. Step 3: Cross multiply
   1,111.13x = 1,531.80 × 756.50
4. Step 4: Simplify right side
   1,111.13x = 1,158,799.04
5. Step 5: Solve for x
   x = 1,158,799.04/1,111.13
6. Step 6: Final answer
   x = 1,042.91