Finding the Fourth Proportional to 3,902.87, 5,387.72 and 2,488.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,902.87 : 5,387.72 = 2,488.45 : x
2. Step 2: Convert to fraction form
   3,902.87/5,387.72 = 2,488.45/x
3. Step 3: Cross multiply
   3,902.87x = 5,387.72 × 2,488.45
4. Step 4: Simplify right side
   3,902.87x = 13,407,080.89
5. Step 5: Solve for x
   x = 13,407,080.89/3,902.87
6. Step 6: Final answer
   x = 3,435.19