Finding the Fourth Proportional to 21,605.12, 29,822.52 and 12,655.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,605.12 : 29,822.52 = 12,655.50 : x
2. Step 2: Convert to fraction form
   21,605.12/29,822.52 = 12,655.50/x
3. Step 3: Cross multiply
   21,605.12x = 29,822.52 × 12,655.50
4. Step 4: Simplify right side
   21,605.12x = 377,418,901.86
5. Step 5: Solve for x
   x = 377,418,901.86/21,605.12
6. Step 6: Final answer
   x = 17,468.96