Finding the Fourth Proportional to 2,307, 3,459.76 and 920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,307 : 3,459.76 = 920.72 : x
2. Step 2: Convert to fraction form
   2,307/3,459.76 = 920.72/x
3. Step 3: Cross multiply
   2,307x = 3,459.76 × 920.72
4. Step 4: Simplify right side
   2,307x = 3,185,470.23
5. Step 5: Solve for x
   x = 3,185,470.23/2,307
6. Step 6: Final answer
   x = 1,380.78