Finding the Fourth Proportional to 142,367.16, 196,470.78 and 78,709.05

Step by Step Solution

1. Step 1: Write the proportion equation
   142,367.16 : 196,470.78 = 78,709.05 : x
2. Step 2: Convert to fraction form
   142,367.16/196,470.78 = 78,709.05/x
3. Step 3: Cross multiply
   142,367.16x = 196,470.78 × 78,709.05
4. Step 4: Simplify right side
   142,367.16x = 15,464,028,888.17
5. Step 5: Solve for x
   x = 15,464,028,888.17/142,367.16
6. Step 6: Final answer
   x = 108,620.76