Finding the Fourth Proportional to 142,656.24, 196,849.60 and 78,978.04

Step by Step Solution

1. Step 1: Write the proportion equation
   142,656.24 : 196,849.60 = 78,978.04 : x
2. Step 2: Convert to fraction form
   142,656.24/196,849.60 = 78,978.04/x
3. Step 3: Cross multiply
   142,656.24x = 196,849.60 × 78,978.04
4. Step 4: Simplify right side
   142,656.24x = 15,546,795,582.78
5. Step 5: Solve for x
   x = 15,546,795,582.78/142,656.24
6. Step 6: Final answer
   x = 108,980.83