Finding the Fourth Proportional to 142,142.51, 196,155.34 and 78,480.76

Step by Step Solution

1. Step 1: Write the proportion equation
   142,142.51 : 196,155.34 = 78,480.76 : x
2. Step 2: Convert to fraction form
   142,142.51/196,155.34 = 78,480.76/x
3. Step 3: Cross multiply
   142,142.51x = 196,155.34 × 78,480.76
4. Step 4: Simplify right side
   142,142.51x = 15,394,420,161.26
5. Step 5: Solve for x
   x = 15,394,420,161.26/142,142.51
6. Step 6: Final answer
   x = 108,302.72