Finding the Fourth Proportional to 7,861.10, 10,859.35 and 7,151.69

Step by Step Solution

1. Step 1: Write the proportion equation
   7,861.10 : 10,859.35 = 7,151.69 : x
2. Step 2: Convert to fraction form
   7,861.10/10,859.35 = 7,151.69/x
3. Step 3: Cross multiply
   7,861.10x = 10,859.35 × 7,151.69
4. Step 4: Simplify right side
   7,861.10x = 77,662,632.63
5. Step 5: Solve for x
   x = 77,662,632.63/7,861.10
6. Step 6: Final answer
   x = 9,879.36