Finding the Fourth Proportional to 142,644.24, 196,840.44 and 78,978.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,644.24 : 196,840.44 = 78,978.24 : x
2. Step 2: Convert to fraction form
   142,644.24/196,840.44 = 78,978.24/x
3. Step 3: Cross multiply
   142,644.24x = 196,840.44 × 78,978.24
4. Step 4: Simplify right side
   142,644.24x = 15,546,111,512.03
5. Step 5: Solve for x
   x = 15,546,111,512.03/142,644.24
6. Step 6: Final answer
   x = 108,985.20