Finding the Fourth Proportional to 21,435.28, 29,598.72 and 16,120.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,435.28 : 29,598.72 = 16,120.84 : x
2. Step 2: Convert to fraction form
   21,435.28/29,598.72 = 16,120.84/x
3. Step 3: Cross multiply
   21,435.28x = 29,598.72 × 16,120.84
4. Step 4: Simplify right side
   21,435.28x = 477,156,229.32
5. Step 5: Solve for x
   x = 477,156,229.32/21,435.28
6. Step 6: Final answer
   x = 22,260.32