Finding the Fourth Proportional to 21,687.84, 32,560.56 and 13,900.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,687.84 : 32,560.56 = 13,900.32 : x
2. Step 2: Convert to fraction form
   21,687.84/32,560.56 = 13,900.32/x
3. Step 3: Cross multiply
   21,687.84x = 32,560.56 × 13,900.32
4. Step 4: Simplify right side
   21,687.84x = 452,602,203.38
5. Step 5: Solve for x
   x = 452,602,203.38/21,687.84
6. Step 6: Final answer
   x = 20,868.94