Finding the Fourth Proportional to 3,899.32, 5,381.20 and 2,407.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.32 : 5,381.20 = 2,407.30 : x
2. Step 2: Convert to fraction form
   3,899.32/5,381.20 = 2,407.30/x
3. Step 3: Cross multiply
   3,899.32x = 5,381.20 × 2,407.30
4. Step 4: Simplify right side
   3,899.32x = 12,954,162.76
5. Step 5: Solve for x
   x = 12,954,162.76/3,899.32
6. Step 6: Final answer
   x = 3,322.16