Finding the Fourth Proportional to 21,561.71, 29,754.90 and 12,001.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,561.71 : 29,754.90 = 12,001.42 : x
2. Step 2: Convert to fraction form
   21,561.71/29,754.90 = 12,001.42/x
3. Step 3: Cross multiply
   21,561.71x = 29,754.90 × 12,001.42
4. Step 4: Simplify right side
   21,561.71x = 357,101,089.15
5. Step 5: Solve for x
   x = 357,101,089.15/21,561.71
6. Step 6: Final answer
   x = 16,561.82