Finding the Fourth Proportional to 1,877.81, 2,591.38 and 1,131.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,877.81 : 2,591.38 = 1,131.57 : x
2. Step 2: Convert to fraction form
   1,877.81/2,591.38 = 1,131.57/x
3. Step 3: Cross multiply
   1,877.81x = 2,591.38 × 1,131.57
4. Step 4: Simplify right side
   1,877.81x = 2,932,309.25
5. Step 5: Solve for x
   x = 2,932,309.25/1,877.81
6. Step 6: Final answer
   x = 1,561.56