Finding the Fourth Proportional to 21,807.72, 32,714.52 and 7,771.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,807.72 : 32,714.52 = 7,771.20 : x
2. Step 2: Convert to fraction form
   21,807.72/32,714.52 = 7,771.20/x
3. Step 3: Cross multiply
   21,807.72x = 32,714.52 × 7,771.20
4. Step 4: Simplify right side
   21,807.72x = 254,231,077.82
5. Step 5: Solve for x
   x = 254,231,077.82/21,807.72
6. Step 6: Final answer
   x = 11,657.85