Finding the Fourth Proportional to 5,411.25, 8,117.69 and 1,902.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,411.25 : 8,117.69 = 1,902.20 : x
2. Step 2: Convert to fraction form
   5,411.25/8,117.69 = 1,902.20/x
3. Step 3: Cross multiply
   5,411.25x = 8,117.69 × 1,902.20
4. Step 4: Simplify right side
   5,411.25x = 15,441,419.82
5. Step 5: Solve for x
   x = 15,441,419.82/5,411.25
6. Step 6: Final answer
   x = 2,853.58