Finding the Fourth Proportional to 2,820.39, 3,892.20 and 1,827.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.39 : 3,892.20 = 1,827.40 : x
2. Step 2: Convert to fraction form
   2,820.39/3,892.20 = 1,827.40/x
3. Step 3: Cross multiply
   2,820.39x = 3,892.20 × 1,827.40
4. Step 4: Simplify right side
   2,820.39x = 7,112,606.28
5. Step 5: Solve for x
   x = 7,112,606.28/2,820.39
6. Step 6: Final answer
   x = 2,521.85