Finding the Fourth Proportional to 31,647.42, 43,671.72 and 18,900.90

Step by Step Solution

1. Step 1: Write the proportion equation
   31,647.42 : 43,671.72 = 18,900.90 : x
2. Step 2: Convert to fraction form
   31,647.42/43,671.72 = 18,900.90/x
3. Step 3: Cross multiply
   31,647.42x = 43,671.72 × 18,900.90
4. Step 4: Simplify right side
   31,647.42x = 825,434,812.55
5. Step 5: Solve for x
   x = 825,434,812.55/31,647.42
6. Step 6: Final answer
   x = 26,082.21