Finding the Fourth Proportional to 3,689.89, 5,092.28 and 2,118.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,689.89 : 5,092.28 = 2,118.22 : x
2. Step 2: Convert to fraction form
   3,689.89/5,092.28 = 2,118.22/x
3. Step 3: Cross multiply
   3,689.89x = 5,092.28 × 2,118.22
4. Step 4: Simplify right side
   3,689.89x = 10,786,569.34
5. Step 5: Solve for x
   x = 10,786,569.34/3,689.89
6. Step 6: Final answer
   x = 2,923.28