Finding the Fourth Proportional to 5,111.39, 7,659.48 and 2,642.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.39 : 7,659.48 = 2,642.92 : x
2. Step 2: Convert to fraction form
   5,111.39/7,659.48 = 2,642.92/x
3. Step 3: Cross multiply
   5,111.39x = 7,659.48 × 2,642.92
4. Step 4: Simplify right side
   5,111.39x = 20,243,373.73
5. Step 5: Solve for x
   x = 20,243,373.73/5,111.39
6. Step 6: Final answer
   x = 3,960.44