Finding the Fourth Proportional to 13,258.55, 19,875.51 and 4,487.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,258.55 : 19,875.51 = 4,487.31 : x
2. Step 2: Convert to fraction form
   13,258.55/19,875.51 = 4,487.31/x
3. Step 3: Cross multiply
   13,258.55x = 19,875.51 × 4,487.31
4. Step 4: Simplify right side
   13,258.55x = 89,187,574.78
5. Step 5: Solve for x
   x = 89,187,574.78/13,258.55
6. Step 6: Final answer
   x = 6,726.80