Finding the Fourth Proportional to 105,081.92, 157,415.52 and 78,816.32

Step by Step Solution

1. Step 1: Write the proportion equation
   105,081.92 : 157,415.52 = 78,816.32 : x
2. Step 2: Convert to fraction form
   105,081.92/157,415.52 = 78,816.32/x
3. Step 3: Cross multiply
   105,081.92x = 157,415.52 × 78,816.32
4. Step 4: Simplify right side
   105,081.92x = 12,406,911,997.29
5. Step 5: Solve for x
   x = 12,406,911,997.29/105,081.92
6. Step 6: Final answer
   x = 118,068.95