Finding the Fourth Proportional to 21,455.28, 32,191.83 and 8,978.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,455.28 : 32,191.83 = 8,978.04 : x
2. Step 2: Convert to fraction form
   21,455.28/32,191.83 = 8,978.04/x
3. Step 3: Cross multiply
   21,455.28x = 32,191.83 × 8,978.04
4. Step 4: Simplify right side
   21,455.28x = 289,019,537.41
5. Step 5: Solve for x
   x = 289,019,537.41/21,455.28
6. Step 6: Final answer
   x = 13,470.79