Finding the Fourth Proportional to 2,787.86, 4,182.69 and 1,678.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,787.86 : 4,182.69 = 1,678.48 : x
2. Step 2: Convert to fraction form
   2,787.86/4,182.69 = 1,678.48/x
3. Step 3: Cross multiply
   2,787.86x = 4,182.69 × 1,678.48
4. Step 4: Simplify right side
   2,787.86x = 7,020,561.51
5. Step 5: Solve for x
   x = 7,020,561.51/2,787.86
6. Step 6: Final answer
   x = 2,518.26