Finding the Fourth Proportional to 2,380.83, 3,278.31 and 2,111.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.83 : 3,278.31 = 2,111.40 : x
2. Step 2: Convert to fraction form
   2,380.83/3,278.31 = 2,111.40/x
3. Step 3: Cross multiply
   2,380.83x = 3,278.31 × 2,111.40
4. Step 4: Simplify right side
   2,380.83x = 6,921,815.82
5. Step 5: Solve for x
   x = 6,921,815.82/2,380.83
6. Step 6: Final answer
   x = 2,907.32