Finding the Fourth Proportional to 5,139.60, 7,090.34 and 3,042.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.60 : 7,090.34 = 3,042.50 : x
2. Step 2: Convert to fraction form
   5,139.60/7,090.34 = 3,042.50/x
3. Step 3: Cross multiply
   5,139.60x = 7,090.34 × 3,042.50
4. Step 4: Simplify right side
   5,139.60x = 21,572,359.45
5. Step 5: Solve for x
   x = 21,572,359.45/5,139.60
6. Step 6: Final answer
   x = 4,197.28