Finding the Fourth Proportional to 1,689.86, 2,328.81 and 1,216.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.86 : 2,328.81 = 1,216.92 : x
2. Step 2: Convert to fraction form
   1,689.86/2,328.81 = 1,216.92/x
3. Step 3: Cross multiply
   1,689.86x = 2,328.81 × 1,216.92
4. Step 4: Simplify right side
   1,689.86x = 2,833,975.47
5. Step 5: Solve for x
   x = 2,833,975.47/1,689.86
6. Step 6: Final answer
   x = 1,677.05