Finding the Fourth Proportional to 40,643.98, 60,943.69 and 12,556.42

Step by Step Solution

1. Step 1: Write the proportion equation
   40,643.98 : 60,943.69 = 12,556.42 : x
2. Step 2: Convert to fraction form
   40,643.98/60,943.69 = 12,556.42/x
3. Step 3: Cross multiply
   40,643.98x = 60,943.69 × 12,556.42
4. Step 4: Simplify right side
   40,643.98x = 765,234,567.99
5. Step 5: Solve for x
   x = 765,234,567.99/40,643.98
6. Step 6: Final answer
   x = 18,827.75