Finding the Fourth Proportional to 5,388.18, 8,083.05 and 1,689.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,388.18 : 8,083.05 = 1,689.72 : x
2. Step 2: Convert to fraction form
   5,388.18/8,083.05 = 1,689.72/x
3. Step 3: Cross multiply
   5,388.18x = 8,083.05 × 1,689.72
4. Step 4: Simplify right side
   5,388.18x = 13,658,091.25
5. Step 5: Solve for x
   x = 13,658,091.25/5,388.18
6. Step 6: Final answer
   x = 2,534.82