Finding the Fourth Proportional to 142,639.02, 196,844.94 and 78,111

Step by Step Solution

1. Step 1: Write the proportion equation
   142,639.02 : 196,844.94 = 78,111 : x
2. Step 2: Convert to fraction form
   142,639.02/196,844.94 = 78,111/x
3. Step 3: Cross multiply
   142,639.02x = 196,844.94 × 78,111
4. Step 4: Simplify right side
   142,639.02x = 15,375,755,108.34
5. Step 5: Solve for x
   x = 15,375,755,108.34/142,639.02
6. Step 6: Final answer
   x = 107,794.87