Finding the Fourth Proportional to 1,877.64, 2,591.28 and 1,131.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,877.64 : 2,591.28 = 1,131.78 : x
2. Step 2: Convert to fraction form
   1,877.64/2,591.28 = 1,131.78/x
3. Step 3: Cross multiply
   1,877.64x = 2,591.28 × 1,131.78
4. Step 4: Simplify right side
   1,877.64x = 2,932,758.88
5. Step 5: Solve for x
   x = 2,932,758.88/1,877.64
6. Step 6: Final answer
   x = 1,561.94