Finding the Fourth Proportional to 12,708, 19,061.04 and 3,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,708 : 19,061.04 = 3,942.72 : x
2. Step 2: Convert to fraction form
   12,708/19,061.04 = 3,942.72/x
3. Step 3: Cross multiply
   12,708x = 19,061.04 × 3,942.72
4. Step 4: Simplify right side
   12,708x = 75,152,343.63
5. Step 5: Solve for x
   x = 75,152,343.63/12,708
6. Step 6: Final answer
   x = 5,913.78