Finding the Fourth Proportional to 8,090.01, 12,139.72 and 3,159.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,090.01 : 12,139.72 = 3,159.40 : x
2. Step 2: Convert to fraction form
   8,090.01/12,139.72 = 3,159.40/x
3. Step 3: Cross multiply
   8,090.01x = 12,139.72 × 3,159.40
4. Step 4: Simplify right side
   8,090.01x = 38,354,215.57
5. Step 5: Solve for x
   x = 38,354,215.57/8,090.01
6. Step 6: Final answer
   x = 4,740.94