Finding the Fourth Proportional to 2,613.35, 3,920.42 and 947.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.35 : 3,920.42 = 947.60 : x
2. Step 2: Convert to fraction form
   2,613.35/3,920.42 = 947.60/x
3. Step 3: Cross multiply
   2,613.35x = 3,920.42 × 947.60
4. Step 4: Simplify right side
   2,613.35x = 3,714,982.13
5. Step 5: Solve for x
   x = 3,714,982.13/2,613.35
6. Step 6: Final answer
   x = 1,421.54