Finding the Fourth Proportional to 40,439.48, 60,665.82 and 12,731

Step by Step Solution

1. Step 1: Write the proportion equation
   40,439.48 : 60,665.82 = 12,731 : x
2. Step 2: Convert to fraction form
   40,439.48/60,665.82 = 12,731/x
3. Step 3: Cross multiply
   40,439.48x = 60,665.82 × 12,731
4. Step 4: Simplify right side
   40,439.48x = 772,336,554.42
5. Step 5: Solve for x
   x = 772,336,554.42/40,439.48
6. Step 6: Final answer
   x = 19,098.58