Finding the Fourth Proportional to 6,987.62, 10,488.72 and 5,140.82

Step by Step Solution

1. Step 1: Write the proportion equation
   6,987.62 : 10,488.72 = 5,140.82 : x
2. Step 2: Convert to fraction form
   6,987.62/10,488.72 = 5,140.82/x
3. Step 3: Cross multiply
   6,987.62x = 10,488.72 × 5,140.82
4. Step 4: Simplify right side
   6,987.62x = 53,920,621.55
5. Step 5: Solve for x
   x = 53,920,621.55/6,987.62
6. Step 6: Final answer
   x = 7,716.59