Finding the Fourth Proportional to 85,814.16, 128,022.42 and 71,860.56

Step by Step Solution

1. Step 1: Write the proportion equation
   85,814.16 : 128,022.42 = 71,860.56 : x
2. Step 2: Convert to fraction form
   85,814.16/128,022.42 = 71,860.56/x
3. Step 3: Cross multiply
   85,814.16x = 128,022.42 × 71,860.56
4. Step 4: Simplify right side
   85,814.16x = 9,199,762,793.76
5. Step 5: Solve for x
   x = 9,199,762,793.76/85,814.16
6. Step 6: Final answer
   x = 107,205.65