Finding the Fourth Proportional to 2,613.89, 3,920.76 and 970.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.89 : 3,920.76 = 970.40 : x
2. Step 2: Convert to fraction form
   2,613.89/3,920.76 = 970.40/x
3. Step 3: Cross multiply
   2,613.89x = 3,920.76 × 970.40
4. Step 4: Simplify right side
   2,613.89x = 3,804,705.50
5. Step 5: Solve for x
   x = 3,804,705.50/2,613.89
6. Step 6: Final answer
   x = 1,455.57