Finding the Fourth Proportional to 12,581.31, 17,346.20 and 7,863.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,581.31 : 17,346.20 = 7,863.87 : x
2. Step 2: Convert to fraction form
   12,581.31/17,346.20 = 7,863.87/x
3. Step 3: Cross multiply
   12,581.31x = 17,346.20 × 7,863.87
4. Step 4: Simplify right side
   12,581.31x = 136,408,222.47
5. Step 5: Solve for x
   x = 136,408,222.47/12,581.31
6. Step 6: Final answer
   x = 10,842.13