Finding the Fourth Proportional to 12,707.20, 19,061.52 and 3,943.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,707.20 : 19,061.52 = 3,943.36 : x
2. Step 2: Convert to fraction form
   12,707.20/19,061.52 = 3,943.36/x
3. Step 3: Cross multiply
   12,707.20x = 19,061.52 × 3,943.36
4. Step 4: Simplify right side
   12,707.20x = 75,166,435.51
5. Step 5: Solve for x
   x = 75,166,435.51/12,707.20
6. Step 6: Final answer
   x = 5,915.26