Finding the Fourth Proportional to 1,636.56, 2,258.52 and 938.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.56 : 2,258.52 = 938.16 : x
2. Step 2: Convert to fraction form
   1,636.56/2,258.52 = 938.16/x
3. Step 3: Cross multiply
   1,636.56x = 2,258.52 × 938.16
4. Step 4: Simplify right side
   1,636.56x = 2,118,853.12
5. Step 5: Solve for x
   x = 2,118,853.12/1,636.56
6. Step 6: Final answer
   x = 1,294.70