Finding the Fourth Proportional to 142,399.22, 196,495.89 and 78,726.74

Step by Step Solution

1. Step 1: Write the proportion equation
   142,399.22 : 196,495.89 = 78,726.74 : x
2. Step 2: Convert to fraction form
   142,399.22/196,495.89 = 78,726.74/x
3. Step 3: Cross multiply
   142,399.22x = 196,495.89 × 78,726.74
4. Step 4: Simplify right side
   142,399.22x = 15,469,480,843.10
5. Step 5: Solve for x
   x = 15,469,480,843.10/142,399.22
6. Step 6: Final answer
   x = 108,634.59