Finding the Fourth Proportional to 21,117.74, 29,116.01 and 13,550.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,117.74 : 29,116.01 = 13,550.72 : x
2. Step 2: Convert to fraction form
   21,117.74/29,116.01 = 13,550.72/x
3. Step 3: Cross multiply
   21,117.74x = 29,116.01 × 13,550.72
4. Step 4: Simplify right side
   21,117.74x = 394,542,685.69
5. Step 5: Solve for x
   x = 394,542,685.69/21,117.74
6. Step 6: Final answer
   x = 18,683.00