Finding the Fourth Proportional to 1,126.84, 1,689.12 and 760.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,126.84 : 1,689.12 = 760.72 : x
2. Step 2: Convert to fraction form
   1,126.84/1,689.12 = 760.72/x
3. Step 3: Cross multiply
   1,126.84x = 1,689.12 × 760.72
4. Step 4: Simplify right side
   1,126.84x = 1,284,947.37
5. Step 5: Solve for x
   x = 1,284,947.37/1,126.84
6. Step 6: Final answer
   x = 1,140.31