Finding the Fourth Proportional to 13,870.68, 19,129.06 and 9,159.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.68 : 19,129.06 = 9,159.72 : x
2. Step 2: Convert to fraction form
   13,870.68/19,129.06 = 9,159.72/x
3. Step 3: Cross multiply
   13,870.68x = 19,129.06 × 9,159.72
4. Step 4: Simplify right side
   13,870.68x = 175,216,833.46
5. Step 5: Solve for x
   x = 175,216,833.46/13,870.68
6. Step 6: Final answer
   x = 12,632.17