Finding the Fourth Proportional to 21,538.72, 32,322.90 and 8,391.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,538.72 : 32,322.90 = 8,391.16 : x
2. Step 2: Convert to fraction form
   21,538.72/32,322.90 = 8,391.16/x
3. Step 3: Cross multiply
   21,538.72x = 32,322.90 × 8,391.16
4. Step 4: Simplify right side
   21,538.72x = 271,226,625.56
5. Step 5: Solve for x
   x = 271,226,625.56/21,538.72
6. Step 6: Final answer
   x = 12,592.51