Finding the Fourth Proportional to 21,411.56, 29,560.86 and 13,972.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,411.56 : 29,560.86 = 13,972.52 : x
2. Step 2: Convert to fraction form
   21,411.56/29,560.86 = 13,972.52/x
3. Step 3: Cross multiply
   21,411.56x = 29,560.86 × 13,972.52
4. Step 4: Simplify right side
   21,411.56x = 413,039,707.57
5. Step 5: Solve for x
   x = 413,039,707.57/21,411.56
6. Step 6: Final answer
   x = 19,290.50