Finding the Fourth Proportional to 2,459.84, 3,690.12 and 920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.84 : 3,690.12 = 920.72 : x
2. Step 2: Convert to fraction form
   2,459.84/3,690.12 = 920.72/x
3. Step 3: Cross multiply
   2,459.84x = 3,690.12 × 920.72
4. Step 4: Simplify right side
   2,459.84x = 3,397,567.29
5. Step 5: Solve for x
   x = 3,397,567.29/2,459.84
6. Step 6: Final answer
   x = 1,381.21