Finding the Fourth Proportional to 1,092.56, 1,507.20 and 761.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.56 : 1,507.20 = 761.28 : x
2. Step 2: Convert to fraction form
   1,092.56/1,507.20 = 761.28/x
3. Step 3: Cross multiply
   1,092.56x = 1,507.20 × 761.28
4. Step 4: Simplify right side
   1,092.56x = 1,147,401.22
5. Step 5: Solve for x
   x = 1,147,401.22/1,092.56
6. Step 6: Final answer
   x = 1,050.20