Finding the Fourth Proportional to 21,462.72, 32,158.98 and 20,642.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,462.72 : 32,158.98 = 20,642.61 : x
2. Step 2: Convert to fraction form
   21,462.72/32,158.98 = 20,642.61/x
3. Step 3: Cross multiply
   21,462.72x = 32,158.98 × 20,642.61
4. Step 4: Simplify right side
   21,462.72x = 663,845,282.14
5. Step 5: Solve for x
   x = 663,845,282.14/21,462.72
6. Step 6: Final answer
   x = 30,930.16