Finding the Fourth Proportional to 142,064.88, 196,052.26 and 78,401.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,064.88 : 196,052.26 = 78,401.31 : x
2. Step 2: Convert to fraction form
   142,064.88/196,052.26 = 78,401.31/x
3. Step 3: Cross multiply
   142,064.88x = 196,052.26 × 78,401.31
4. Step 4: Simplify right side
   142,064.88x = 15,370,754,012.46
5. Step 5: Solve for x
   x = 15,370,754,012.46/142,064.88
6. Step 6: Final answer
   x = 108,195.31