Finding the Fourth Proportional to 2,798.15, 3,859.30 and 1,902.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,798.15 : 3,859.30 = 1,902.57 : x
2. Step 2: Convert to fraction form
   2,798.15/3,859.30 = 1,902.57/x
3. Step 3: Cross multiply
   2,798.15x = 3,859.30 × 1,902.57
4. Step 4: Simplify right side
   2,798.15x = 7,342,588.40
5. Step 5: Solve for x
   x = 7,342,588.40/2,798.15
6. Step 6: Final answer
   x = 2,624.09