Finding the Fourth Proportional to 1,111.12, 1,531.92 and 761.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.12 : 1,531.92 = 761.20 : x
2. Step 2: Convert to fraction form
   1,111.12/1,531.92 = 761.20/x
3. Step 3: Cross multiply
   1,111.12x = 1,531.92 × 761.20
4. Step 4: Simplify right side
   1,111.12x = 1,166,097.50
5. Step 5: Solve for x
   x = 1,166,097.50/1,111.12
6. Step 6: Final answer
   x = 1,049.48