Finding the Fourth Proportional to 5,280.83, 7,287.46 and 2,890.74

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.83 : 7,287.46 = 2,890.74 : x
2. Step 2: Convert to fraction form
   5,280.83/7,287.46 = 2,890.74/x
3. Step 3: Cross multiply
   5,280.83x = 7,287.46 × 2,890.74
4. Step 4: Simplify right side
   5,280.83x = 21,066,152.12
5. Step 5: Solve for x
   x = 21,066,152.12/5,280.83
6. Step 6: Final answer
   x = 3,989.17