Finding the Fourth Proportional to 1,131.84, 1,560.69 and 781.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.84 : 1,560.69 = 781.92 : x
2. Step 2: Convert to fraction form
   1,131.84/1,560.69 = 781.92/x
3. Step 3: Cross multiply
   1,131.84x = 1,560.69 × 781.92
4. Step 4: Simplify right side
   1,131.84x = 1,220,334.72
5. Step 5: Solve for x
   x = 1,220,334.72/1,131.84
6. Step 6: Final answer
   x = 1,078.19