Finding the Fourth Proportional to 5,298.71, 7,942.78 and 2,658.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,298.71 : 7,942.78 = 2,658.15 : x
2. Step 2: Convert to fraction form
   5,298.71/7,942.78 = 2,658.15/x
3. Step 3: Cross multiply
   5,298.71x = 7,942.78 × 2,658.15
4. Step 4: Simplify right side
   5,298.71x = 21,113,100.66
5. Step 5: Solve for x
   x = 21,113,100.66/5,298.71
6. Step 6: Final answer
   x = 3,984.57