Finding the Fourth Proportional to 107,712.42, 161,328.03 and 78,062.18

Step by Step Solution

1. Step 1: Write the proportion equation
   107,712.42 : 161,328.03 = 78,062.18 : x
2. Step 2: Convert to fraction form
   107,712.42/161,328.03 = 78,062.18/x
3. Step 3: Cross multiply
   107,712.42x = 161,328.03 × 78,062.18
4. Step 4: Simplify right side
   107,712.42x = 12,593,616,910.27
5. Step 5: Solve for x
   x = 12,593,616,910.27/107,712.42
6. Step 6: Final answer
   x = 116,918.89