Finding the Fourth Proportional to 105,222.24, 157,697.28 and 78,719.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,222.24 : 157,697.28 = 78,719.04 : x
2. Step 2: Convert to fraction form
   105,222.24/157,697.28 = 78,719.04/x
3. Step 3: Cross multiply
   105,222.24x = 157,697.28 × 78,719.04
4. Step 4: Simplify right side
   105,222.24x = 12,413,778,492.21
5. Step 5: Solve for x
   x = 12,413,778,492.21/105,222.24
6. Step 6: Final answer
   x = 117,976.76