Finding the Fourth Proportional to 85,730.91, 128,679.37 and 41,388.79

Step by Step Solution

1. Step 1: Write the proportion equation
   85,730.91 : 128,679.37 = 41,388.79 : x
2. Step 2: Convert to fraction form
   85,730.91/128,679.37 = 41,388.79/x
3. Step 3: Cross multiply
   85,730.91x = 128,679.37 × 41,388.79
4. Step 4: Simplify right side
   85,730.91x = 5,325,882,997.09
5. Step 5: Solve for x
   x = 5,325,882,997.09/85,730.91
6. Step 6: Final answer
   x = 62,123.25