Finding the Fourth Proportional to 142,553.37, 196,723.89 and 78,891.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142,553.37 : 196,723.89 = 78,891.18 : x
2. Step 2: Convert to fraction form
   142,553.37/196,723.89 = 78,891.18/x
3. Step 3: Cross multiply
   142,553.37x = 196,723.89 × 78,891.18
4. Step 4: Simplify right side
   142,553.37x = 15,519,779,816.29
5. Step 5: Solve for x
   x = 15,519,779,816.29/142,553.37
6. Step 6: Final answer
   x = 108,869.96