Finding the Fourth Proportional to 11,748.42, 17,620.94 and 3,426.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,748.42 : 17,620.94 = 3,426.20 : x
2. Step 2: Convert to fraction form
   11,748.42/17,620.94 = 3,426.20/x
3. Step 3: Cross multiply
   11,748.42x = 17,620.94 × 3,426.20
4. Step 4: Simplify right side
   11,748.42x = 60,372,864.63
5. Step 5: Solve for x
   x = 60,372,864.63/11,748.42
6. Step 6: Final answer
   x = 5,138.81