Finding the Fourth Proportional to 131,401.70, 197,131.35 and 42,640.10

Step by Step Solution

1. Step 1: Write the proportion equation
   131,401.70 : 197,131.35 = 42,640.10 : x
2. Step 2: Convert to fraction form
   131,401.70/197,131.35 = 42,640.10/x
3. Step 3: Cross multiply
   131,401.70x = 197,131.35 × 42,640.10
4. Step 4: Simplify right side
   131,401.70x = 8,405,700,477.14
5. Step 5: Solve for x
   x = 8,405,700,477.14/131,401.70
6. Step 6: Final answer
   x = 63,969.50