Finding the Fourth Proportional to 5,338.61, 7,988.55 and 3,860.79

Step by Step Solution

1. Step 1: Write the proportion equation
   5,338.61 : 7,988.55 = 3,860.79 : x
2. Step 2: Convert to fraction form
   5,338.61/7,988.55 = 3,860.79/x
3. Step 3: Cross multiply
   5,338.61x = 7,988.55 × 3,860.79
4. Step 4: Simplify right side
   5,338.61x = 30,842,113.95
5. Step 5: Solve for x
   x = 30,842,113.95/5,338.61
6. Step 6: Final answer
   x = 5,777.18