Finding the Fourth Proportional to 31,121.60, 42,948 and 16,974.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,121.60 : 42,948 = 16,974.72 : x
2. Step 2: Convert to fraction form
   31,121.60/42,948 = 16,974.72/x
3. Step 3: Cross multiply
   31,121.60x = 42,948 × 16,974.72
4. Step 4: Simplify right side
   31,121.60x = 729,030,274.56
5. Step 5: Solve for x
   x = 729,030,274.56/31,121.60
6. Step 6: Final answer
   x = 23,425.22