Finding the Fourth Proportional to 31,540.42, 43,532.10 and 18,120.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,540.42 : 43,532.10 = 18,120.88 : x
2. Step 2: Convert to fraction form
   31,540.42/43,532.10 = 18,120.88/x
3. Step 3: Cross multiply
   31,540.42x = 43,532.10 × 18,120.88
4. Step 4: Simplify right side
   31,540.42x = 788,839,960.25
5. Step 5: Solve for x
   x = 788,839,960.25/31,540.42
6. Step 6: Final answer
   x = 25,010.45