Finding the Fourth Proportional to 40,476.84, 60,718.50 and 12,399.12

Step by Step Solution

1. Step 1: Write the proportion equation
   40,476.84 : 60,718.50 = 12,399.12 : x
2. Step 2: Convert to fraction form
   40,476.84/60,718.50 = 12,399.12/x
3. Step 3: Cross multiply
   40,476.84x = 60,718.50 × 12,399.12
4. Step 4: Simplify right side
   40,476.84x = 752,855,967.72
5. Step 5: Solve for x
   x = 752,855,967.72/40,476.84
6. Step 6: Final answer
   x = 18,599.67