Finding the Fourth Proportional to 1,638.33, 2,260.91 and 930.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.33 : 2,260.91 = 930.15 : x
2. Step 2: Convert to fraction form
   1,638.33/2,260.91 = 930.15/x
3. Step 3: Cross multiply
   1,638.33x = 2,260.91 × 930.15
4. Step 4: Simplify right side
   1,638.33x = 2,102,976.46
5. Step 5: Solve for x
   x = 2,102,976.46/1,638.33
6. Step 6: Final answer
   x = 1,283.61