Finding the Fourth Proportional to 21,656.16, 32,490.72 and 9,969.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,656.16 : 32,490.72 = 9,969.48 : x
2. Step 2: Convert to fraction form
   21,656.16/32,490.72 = 9,969.48/x
3. Step 3: Cross multiply
   21,656.16x = 32,490.72 × 9,969.48
4. Step 4: Simplify right side
   21,656.16x = 323,915,583.23
5. Step 5: Solve for x
   x = 323,915,583.23/21,656.16
6. Step 6: Final answer
   x = 14,957.20