Finding the Fourth Proportional to 2,407.60, 3,612.88 and 946.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,407.60 : 3,612.88 = 946.72 : x
2. Step 2: Convert to fraction form
   2,407.60/3,612.88 = 946.72/x
3. Step 3: Cross multiply
   2,407.60x = 3,612.88 × 946.72
4. Step 4: Simplify right side
   2,407.60x = 3,420,385.75
5. Step 5: Solve for x
   x = 3,420,385.75/2,407.60
6. Step 6: Final answer
   x = 1,420.66