Finding the Fourth Proportional to 142,109.80, 196,106.34 and 78,447.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,109.80 : 196,106.34 = 78,447.40 : x
2. Step 2: Convert to fraction form
   142,109.80/196,106.34 = 78,447.40/x
3. Step 3: Cross multiply
   142,109.80x = 196,106.34 × 78,447.40
4. Step 4: Simplify right side
   142,109.80x = 15,384,032,496.52
5. Step 5: Solve for x
   x = 15,384,032,496.52/142,109.80
6. Step 6: Final answer
   x = 108,254.55