Finding the Fourth Proportional to 21,431.76, 32,146.05 and 7,200.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,431.76 : 32,146.05 = 7,200.33 : x
2. Step 2: Convert to fraction form
   21,431.76/32,146.05 = 7,200.33/x
3. Step 3: Cross multiply
   21,431.76x = 32,146.05 × 7,200.33
4. Step 4: Simplify right side
   21,431.76x = 231,462,168.20
5. Step 5: Solve for x
   x = 231,462,168.20/21,431.76
6. Step 6: Final answer
   x = 10,799.96