Finding the Fourth Proportional to 1,539.71, 2,124.72 and 876.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,539.71 : 2,124.72 = 876.56 : x
2. Step 2: Convert to fraction form
   1,539.71/2,124.72 = 876.56/x
3. Step 3: Cross multiply
   1,539.71x = 2,124.72 × 876.56
4. Step 4: Simplify right side
   1,539.71x = 1,862,444.56
5. Step 5: Solve for x
   x = 1,862,444.56/1,539.71
6. Step 6: Final answer
   x = 1,209.61