Finding the Fourth Proportional to 142,647.84, 196,865.28 and 78,991.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,647.84 : 196,865.28 = 78,991.56 : x
2. Step 2: Convert to fraction form
   142,647.84/196,865.28 = 78,991.56/x
3. Step 3: Cross multiply
   142,647.84x = 196,865.28 × 78,991.56
4. Step 4: Simplify right side
   142,647.84x = 15,550,695,577.04
5. Step 5: Solve for x
   x = 15,550,695,577.04/142,647.84
6. Step 6: Final answer
   x = 109,014.59