Finding the Fourth Proportional to 142,564.86, 196,742.79 and 78,905.34

Step by Step Solution

1. Step 1: Write the proportion equation
   142,564.86 : 196,742.79 = 78,905.34 : x
2. Step 2: Convert to fraction form
   142,564.86/196,742.79 = 78,905.34/x
3. Step 3: Cross multiply
   142,564.86x = 196,742.79 × 78,905.34
4. Step 4: Simplify right side
   142,564.86x = 15,524,056,737.50
5. Step 5: Solve for x
   x = 15,524,056,737.50/142,564.86
6. Step 6: Final answer
   x = 108,891.19