Finding the Fourth Proportional to 21,356.10, 32,066.55 and 16,431.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,356.10 : 32,066.55 = 16,431.30 : x
2. Step 2: Convert to fraction form
   21,356.10/32,066.55 = 16,431.30/x
3. Step 3: Cross multiply
   21,356.10x = 32,066.55 × 16,431.30
4. Step 4: Simplify right side
   21,356.10x = 526,895,103.02
5. Step 5: Solve for x
   x = 526,895,103.02/21,356.10
6. Step 6: Final answer
   x = 24,671.88