Finding the Fourth Proportional to 1,540.31, 2,125.61 and 877.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.31 : 2,125.61 = 877.15 : x
2. Step 2: Convert to fraction form
   1,540.31/2,125.61 = 877.15/x
3. Step 3: Cross multiply
   1,540.31x = 2,125.61 × 877.15
4. Step 4: Simplify right side
   1,540.31x = 1,864,475.69
5. Step 5: Solve for x
   x = 1,864,475.69/1,540.31
6. Step 6: Final answer
   x = 1,210.46