Finding the Fourth Proportional to 1,638.29, 2,456.51 and 1,118.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.29 : 2,456.51 = 1,118.93 : x
2. Step 2: Convert to fraction form
   1,638.29/2,456.51 = 1,118.93/x
3. Step 3: Cross multiply
   1,638.29x = 2,456.51 × 1,118.93
4. Step 4: Simplify right side
   1,638.29x = 2,748,644.86
5. Step 5: Solve for x
   x = 2,748,644.86/1,638.29
6. Step 6: Final answer
   x = 1,677.76