Finding the Fourth Proportional to 2,755.95, 4,134.15 and 781.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,755.95 : 4,134.15 = 781.61 : x
2. Step 2: Convert to fraction form
   2,755.95/4,134.15 = 781.61/x
3. Step 3: Cross multiply
   2,755.95x = 4,134.15 × 781.61
4. Step 4: Simplify right side
   2,755.95x = 3,231,272.31
5. Step 5: Solve for x
   x = 3,231,272.31/2,755.95
6. Step 6: Final answer
   x = 1,172.47