Finding the Fourth Proportional to 2,478.38, 3,421.98 and 1,691.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.38 : 3,421.98 = 1,691.06 : x
2. Step 2: Convert to fraction form
   2,478.38/3,421.98 = 1,691.06/x
3. Step 3: Cross multiply
   2,478.38x = 3,421.98 × 1,691.06
4. Step 4: Simplify right side
   2,478.38x = 5,786,756.39
5. Step 5: Solve for x
   x = 5,786,756.39/2,478.38
6. Step 6: Final answer
   x = 2,334.90