Finding the Fourth Proportional to 142,129.41, 196,141.89 and 78,468.48

Step by Step Solution

1. Step 1: Write the proportion equation
   142,129.41 : 196,141.89 = 78,468.48 : x
2. Step 2: Convert to fraction form
   142,129.41/196,141.89 = 78,468.48/x
3. Step 3: Cross multiply
   142,129.41x = 196,141.89 × 78,468.48
4. Step 4: Simplify right side
   142,129.41x = 15,390,955,972.63
5. Step 5: Solve for x
   x = 15,390,955,972.63/142,129.41
6. Step 6: Final answer
   x = 108,288.33