Finding the Fourth Proportional to 3,961.68, 5,467.56 and 2,389.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,961.68 : 5,467.56 = 2,389.80 : x
2. Step 2: Convert to fraction form
   3,961.68/5,467.56 = 2,389.80/x
3. Step 3: Cross multiply
   3,961.68x = 5,467.56 × 2,389.80
4. Step 4: Simplify right side
   3,961.68x = 13,066,374.89
5. Step 5: Solve for x
   x = 13,066,374.89/3,961.68
6. Step 6: Final answer
   x = 3,298.19