Finding the Fourth Proportional to 142,658.88, 196,866.83 and 78,995.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,658.88 : 196,866.83 = 78,995.31 : x
2. Step 2: Convert to fraction form
   142,658.88/196,866.83 = 78,995.31/x
3. Step 3: Cross multiply
   142,658.88x = 196,866.83 × 78,995.31
4. Step 4: Simplify right side
   142,658.88x = 15,551,554,885.26
5. Step 5: Solve for x
   x = 15,551,554,885.26/142,658.88
6. Step 6: Final answer
   x = 109,012.18