Finding the Fourth Proportional to 81,104.51, 111,111.32 and 78,072.18

Step by Step Solution

1. Step 1: Write the proportion equation
   81,104.51 : 111,111.32 = 78,072.18 : x
2. Step 2: Convert to fraction form
   81,104.51/111,111.32 = 78,072.18/x
3. Step 3: Cross multiply
   81,104.51x = 111,111.32 × 78,072.18
4. Step 4: Simplify right side
   81,104.51x = 8,674,702,584.72
5. Step 5: Solve for x
   x = 8,674,702,584.72/81,104.51
6. Step 6: Final answer
   x = 106,957.10