Finding the Fourth Proportional to 6,987.82, 10,472.47 and 5,130.25

Step by Step Solution

1. Step 1: Write the proportion equation
   6,987.82 : 10,472.47 = 5,130.25 : x
2. Step 2: Convert to fraction form
   6,987.82/10,472.47 = 5,130.25/x
3. Step 3: Cross multiply
   6,987.82x = 10,472.47 × 5,130.25
4. Step 4: Simplify right side
   6,987.82x = 53,726,389.22
5. Step 5: Solve for x
   x = 53,726,389.22/6,987.82
6. Step 6: Final answer
   x = 7,688.58