Finding the Fourth Proportional to 142,656.42, 196,865.73 and 78,994.21

Step by Step Solution

1. Step 1: Write the proportion equation
   142,656.42 : 196,865.73 = 78,994.21 : x
2. Step 2: Convert to fraction form
   142,656.42/196,865.73 = 78,994.21/x
3. Step 3: Cross multiply
   142,656.42x = 196,865.73 × 78,994.21
4. Step 4: Simplify right side
   142,656.42x = 15,551,252,817.42
5. Step 5: Solve for x
   x = 15,551,252,817.42/142,656.42
6. Step 6: Final answer
   x = 109,011.94