Finding the Fourth Proportional to 21,659.47, 32,469.76 and 7,798.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,659.47 : 32,469.76 = 7,798.75 : x
2. Step 2: Convert to fraction form
   21,659.47/32,469.76 = 7,798.75/x
3. Step 3: Cross multiply
   21,659.47x = 32,469.76 × 7,798.75
4. Step 4: Simplify right side
   21,659.47x = 253,223,540.80
5. Step 5: Solve for x
   x = 253,223,540.80/21,659.47
6. Step 6: Final answer
   x = 11,691.12