Finding the Fourth Proportional to 2,308.15, 3,460.33 and 920.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.15 : 3,460.33 = 920.89 : x
2. Step 2: Convert to fraction form
   2,308.15/3,460.33 = 920.89/x
3. Step 3: Cross multiply
   2,308.15x = 3,460.33 × 920.89
4. Step 4: Simplify right side
   2,308.15x = 3,186,583.29
5. Step 5: Solve for x
   x = 3,186,583.29/2,308.15
6. Step 6: Final answer
   x = 1,380.58