Finding the Fourth Proportional to 142,131.09, 196,142.37 and 78,468.74

Step by Step Solution

1. Step 1: Write the proportion equation
   142,131.09 : 196,142.37 = 78,468.74 : x
2. Step 2: Convert to fraction form
   142,131.09/196,142.37 = 78,468.74/x
3. Step 3: Cross multiply
   142,131.09x = 196,142.37 × 78,468.74
4. Step 4: Simplify right side
   142,131.09x = 15,391,044,634.51
5. Step 5: Solve for x
   x = 15,391,044,634.51/142,131.09
6. Step 6: Final answer
   x = 108,287.67