Finding the Fourth Proportional to 107,929.16, 161,877.94 and 78,085.72

Step by Step Solution

1. Step 1: Write the proportion equation
   107,929.16 : 161,877.94 = 78,085.72 : x
2. Step 2: Convert to fraction form
   107,929.16/161,877.94 = 78,085.72/x
3. Step 3: Cross multiply
   107,929.16x = 161,877.94 × 78,085.72
4. Step 4: Simplify right side
   107,929.16x = 12,640,355,497.02
5. Step 5: Solve for x
   x = 12,640,355,497.02/107,929.16
6. Step 6: Final answer
   x = 117,117.15