Finding the Fourth Proportional to 3,687.78, 5,089.86 and 2,116.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,687.78 : 5,089.86 = 2,116.92 : x
2. Step 2: Convert to fraction form
   3,687.78/5,089.86 = 2,116.92/x
3. Step 3: Cross multiply
   3,687.78x = 5,089.86 × 2,116.92
4. Step 4: Simplify right side
   3,687.78x = 10,774,826.43
5. Step 5: Solve for x
   x = 10,774,826.43/3,687.78
6. Step 6: Final answer
   x = 2,921.76