Finding the Fourth Proportional to 21,439.72, 32,158.02 and 7,208.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,439.72 : 32,158.02 = 7,208.29 : x
2. Step 2: Convert to fraction form
   21,439.72/32,158.02 = 7,208.29/x
3. Step 3: Cross multiply
   21,439.72x = 32,158.02 × 7,208.29
4. Step 4: Simplify right side
   21,439.72x = 231,804,173.20
5. Step 5: Solve for x
   x = 231,804,173.20/21,439.72
6. Step 6: Final answer
   x = 10,811.91