Finding the Fourth Proportional to 142,401.78, 196,578.90 and 91,488.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,401.78 : 196,578.90 = 91,488.42 : x
2. Step 2: Convert to fraction form
   142,401.78/196,578.90 = 91,488.42/x
3. Step 3: Cross multiply
   142,401.78x = 196,578.90 × 91,488.42
4. Step 4: Simplify right side
   142,401.78x = 17,984,692,966.34
5. Step 5: Solve for x
   x = 17,984,692,966.34/142,401.78
6. Step 6: Final answer
   x = 126,295.42