Finding the Fourth Proportional to 4,978.18, 7,462.63 and 1,689

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.18 : 7,462.63 = 1,689 : x
2. Step 2: Convert to fraction form
   4,978.18/7,462.63 = 1,689/x
3. Step 3: Cross multiply
   4,978.18x = 7,462.63 × 1,689
4. Step 4: Simplify right side
   4,978.18x = 12,604,382.07
5. Step 5: Solve for x
   x = 12,604,382.07/4,978.18
6. Step 6: Final answer
   x = 2,531.93