Finding the Fourth Proportional to 2,818.31, 3,892.35 and 1,878.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.31 : 3,892.35 = 1,878.09 : x
2. Step 2: Convert to fraction form
   2,818.31/3,892.35 = 1,878.09/x
3. Step 3: Cross multiply
   2,818.31x = 3,892.35 × 1,878.09
4. Step 4: Simplify right side
   2,818.31x = 7,310,191.88
5. Step 5: Solve for x
   x = 7,310,191.88/2,818.31
6. Step 6: Final answer
   x = 2,593.82