Finding the Fourth Proportional to 12,251.03, 18,377.55 and 3,931.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,251.03 : 18,377.55 = 3,931.20 : x
2. Step 2: Convert to fraction form
   12,251.03/18,377.55 = 3,931.20/x
3. Step 3: Cross multiply
   12,251.03x = 18,377.55 × 3,931.20
4. Step 4: Simplify right side
   12,251.03x = 72,245,824.56
5. Step 5: Solve for x
   x = 72,245,824.56/12,251.03
6. Step 6: Final answer
   x = 5,897.12