Finding the Fourth Proportional to 7,875.10, 10,859.29 and 7,081.57

Step by Step Solution

1. Step 1: Write the proportion equation
   7,875.10 : 10,859.29 = 7,081.57 : x
2. Step 2: Convert to fraction form
   7,875.10/10,859.29 = 7,081.57/x
3. Step 3: Cross multiply
   7,875.10x = 10,859.29 × 7,081.57
4. Step 4: Simplify right side
   7,875.10x = 76,900,777.43
5. Step 5: Solve for x
   x = 76,900,777.43/7,875.10
6. Step 6: Final answer
   x = 9,765.06