Finding the Fourth Proportional to 81,112.05, 111,121.62 and 78,079.71

Step by Step Solution

1. Step 1: Write the proportion equation
   81,112.05 : 111,121.62 = 78,079.71 : x
2. Step 2: Convert to fraction form
   81,112.05/111,121.62 = 78,079.71/x
3. Step 3: Cross multiply
   81,112.05x = 111,121.62 × 78,079.71
4. Step 4: Simplify right side
   81,112.05x = 8,676,343,864.33
5. Step 5: Solve for x
   x = 8,676,343,864.33/81,112.05
6. Step 6: Final answer
   x = 106,967.38