Finding the Fourth Proportional to 7,129.92, 10,651.38 and 6,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,129.92 : 10,651.38 = 6,870.72 : x
2. Step 2: Convert to fraction form
   7,129.92/10,651.38 = 6,870.72/x
3. Step 3: Cross multiply
   7,129.92x = 10,651.38 × 6,870.72
4. Step 4: Simplify right side
   7,129.92x = 73,182,649.59
5. Step 5: Solve for x
   x = 73,182,649.59/7,129.92
6. Step 6: Final answer
   x = 10,264.16