Finding the Fourth Proportional to 2,772.59, 4,160.39 and 1,191.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,772.59 : 4,160.39 = 1,191.15 : x
2. Step 2: Convert to fraction form
   2,772.59/4,160.39 = 1,191.15/x
3. Step 3: Cross multiply
   2,772.59x = 4,160.39 × 1,191.15
4. Step 4: Simplify right side
   2,772.59x = 4,955,642.59
5. Step 5: Solve for x
   x = 4,955,642.59/2,772.59
6. Step 6: Final answer
   x = 1,787.37