Finding the Fourth Proportional to 3,980.94, 5,494.34 and 3,875.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.94 : 5,494.34 = 3,875.64 : x
2. Step 2: Convert to fraction form
   3,980.94/5,494.34 = 3,875.64/x
3. Step 3: Cross multiply
   3,980.94x = 5,494.34 × 3,875.64
4. Step 4: Simplify right side
   3,980.94x = 21,294,093.57
5. Step 5: Solve for x
   x = 21,294,093.57/3,980.94
6. Step 6: Final answer
   x = 5,349.01