Finding the Fourth Proportional to 11,739.57, 17,612.42 and 3,419.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,739.57 : 17,612.42 = 3,419.40 : x
2. Step 2: Convert to fraction form
   11,739.57/17,612.42 = 3,419.40/x
3. Step 3: Cross multiply
   11,739.57x = 17,612.42 × 3,419.40
4. Step 4: Simplify right side
   11,739.57x = 60,223,908.95
5. Step 5: Solve for x
   x = 60,223,908.95/11,739.57
6. Step 6: Final answer
   x = 5,129.99