Finding the Fourth Proportional to 142,291.55, 196,362.40 and 78,629.34

Step by Step Solution

1. Step 1: Write the proportion equation
   142,291.55 : 196,362.40 = 78,629.34 : x
2. Step 2: Convert to fraction form
   142,291.55/196,362.40 = 78,629.34/x
3. Step 3: Cross multiply
   142,291.55x = 196,362.40 × 78,629.34
4. Step 4: Simplify right side
   142,291.55x = 15,439,845,912.82
5. Step 5: Solve for x
   x = 15,439,845,912.82/142,291.55
6. Step 6: Final answer
   x = 108,508.53