Finding the Fourth Proportional to 3,987.42, 5,502.82 and 2,308.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.42 : 5,502.82 = 2,308.90 : x
2. Step 2: Convert to fraction form
   3,987.42/5,502.82 = 2,308.90/x
3. Step 3: Cross multiply
   3,987.42x = 5,502.82 × 2,308.90
4. Step 4: Simplify right side
   3,987.42x = 12,705,461.10
5. Step 5: Solve for x
   x = 12,705,461.10/3,987.42
6. Step 6: Final answer
   x = 3,186.39