Finding the Fourth Proportional to 3,680.71, 5,077.72 and 2,187.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.71 : 5,077.72 = 2,187.78 : x
2. Step 2: Convert to fraction form
   3,680.71/5,077.72 = 2,187.78/x
3. Step 3: Cross multiply
   3,680.71x = 5,077.72 × 2,187.78
4. Step 4: Simplify right side
   3,680.71x = 11,108,917.95
5. Step 5: Solve for x
   x = 11,108,917.95/3,680.71
6. Step 6: Final answer
   x = 3,018.15