Finding the Fourth Proportional to 2,661.72, 3,992.60 and 930.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.72 : 3,992.60 = 930.34 : x
2. Step 2: Convert to fraction form
   2,661.72/3,992.60 = 930.34/x
3. Step 3: Cross multiply
   2,661.72x = 3,992.60 × 930.34
4. Step 4: Simplify right side
   2,661.72x = 3,714,475.48
5. Step 5: Solve for x
   x = 3,714,475.48/2,661.72
6. Step 6: Final answer
   x = 1,395.52