Finding the Fourth Proportional to 5,280.72, 7,921.94 and 1,994.10

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.72 : 7,921.94 = 1,994.10 : x
2. Step 2: Convert to fraction form
   5,280.72/7,921.94 = 1,994.10/x
3. Step 3: Cross multiply
   5,280.72x = 7,921.94 × 1,994.10
4. Step 4: Simplify right side
   5,280.72x = 15,797,140.55
5. Step 5: Solve for x
   x = 15,797,140.55/5,280.72
6. Step 6: Final answer
   x = 2,991.47