Finding the Fourth Proportional to 23,431.30, 32,335.72 and 12,820.95

Step by Step Solution

1. Step 1: Write the proportion equation
   23,431.30 : 32,335.72 = 12,820.95 : x
2. Step 2: Convert to fraction form
   23,431.30/32,335.72 = 12,820.95/x
3. Step 3: Cross multiply
   23,431.30x = 32,335.72 × 12,820.95
4. Step 4: Simplify right side
   23,431.30x = 414,574,617.28
5. Step 5: Solve for x
   x = 414,574,617.28/23,431.30
6. Step 6: Final answer
   x = 17,693.20