Finding the Fourth Proportional to 21,626.88, 29,847.18 and 13,127.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,626.88 : 29,847.18 = 13,127.05 : x
2. Step 2: Convert to fraction form
   21,626.88/29,847.18 = 13,127.05/x
3. Step 3: Cross multiply
   21,626.88x = 29,847.18 × 13,127.05
4. Step 4: Simplify right side
   21,626.88x = 391,805,342.86
5. Step 5: Solve for x
   x = 391,805,342.86/21,626.88
6. Step 6: Final answer
   x = 18,116.59