Finding the Fourth Proportional to 21,255.55, 32,009.83 and 18,515.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,255.55 : 32,009.83 = 18,515.32 : x
2. Step 2: Convert to fraction form
   21,255.55/32,009.83 = 18,515.32/x
3. Step 3: Cross multiply
   21,255.55x = 32,009.83 × 18,515.32
4. Step 4: Simplify right side
   21,255.55x = 592,672,119.28
5. Step 5: Solve for x
   x = 592,672,119.28/21,255.55
6. Step 6: Final answer
   x = 27,883.17