Finding the Fourth Proportional to 1,371.72, 2,056.24 and 876.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.72 : 2,056.24 = 876.61 : x
2. Step 2: Convert to fraction form
   1,371.72/2,056.24 = 876.61/x
3. Step 3: Cross multiply
   1,371.72x = 2,056.24 × 876.61
4. Step 4: Simplify right side
   1,371.72x = 1,802,520.55
5. Step 5: Solve for x
   x = 1,802,520.55/1,371.72
6. Step 6: Final answer
   x = 1,314.06