Finding the Fourth Proportional to 40,436.98, 60,662.07 and 12,728.50

Step by Step Solution

1. Step 1: Write the proportion equation
   40,436.98 : 60,662.07 = 12,728.50 : x
2. Step 2: Convert to fraction form
   40,436.98/60,662.07 = 12,728.50/x
3. Step 3: Cross multiply
   40,436.98x = 60,662.07 × 12,728.50
4. Step 4: Simplify right side
   40,436.98x = 772,137,158.00
5. Step 5: Solve for x
   x = 772,137,158.00/40,436.98
6. Step 6: Final answer
   x = 19,094.83