Finding the Fourth Proportional to 2,665.90, 3,678.78 and 1,486.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.90 : 3,678.78 = 1,486.95 : x
2. Step 2: Convert to fraction form
   2,665.90/3,678.78 = 1,486.95/x
3. Step 3: Cross multiply
   2,665.90x = 3,678.78 × 1,486.95
4. Step 4: Simplify right side
   2,665.90x = 5,470,161.92
5. Step 5: Solve for x
   x = 5,470,161.92/2,665.90
6. Step 6: Final answer
   x = 2,051.90