Finding the Fourth Proportional to 1,638.15, 2,260.89 and 930.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.15 : 2,260.89 = 930.18 : x
2. Step 2: Convert to fraction form
   1,638.15/2,260.89 = 930.18/x
3. Step 3: Cross multiply
   1,638.15x = 2,260.89 × 930.18
4. Step 4: Simplify right side
   1,638.15x = 2,103,034.66
5. Step 5: Solve for x
   x = 2,103,034.66/1,638.15
6. Step 6: Final answer
   x = 1,283.79