Finding the Fourth Proportional to 21,401.28, 32,080.86 and 12,505.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,401.28 : 32,080.86 = 12,505.32 : x
2. Step 2: Convert to fraction form
   21,401.28/32,080.86 = 12,505.32/x
3. Step 3: Cross multiply
   21,401.28x = 32,080.86 × 12,505.32
4. Step 4: Simplify right side
   21,401.28x = 401,181,420.18
5. Step 5: Solve for x
   x = 401,181,420.18/21,401.28
6. Step 6: Final answer
   x = 18,745.67