Finding the Fourth Proportional to 21,620.53, 29,836.38 and 12,061.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,620.53 : 29,836.38 = 12,061.32 : x
2. Step 2: Convert to fraction form
   21,620.53/29,836.38 = 12,061.32/x
3. Step 3: Cross multiply
   21,620.53x = 29,836.38 × 12,061.32
4. Step 4: Simplify right side
   21,620.53x = 359,866,126.82
5. Step 5: Solve for x
   x = 359,866,126.82/21,620.53
6. Step 6: Final answer
   x = 16,644.65