Finding the Fourth Proportional to 2,661.31, 3,993.80 and 929.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.31 : 3,993.80 = 929.94 : x
2. Step 2: Convert to fraction form
   2,661.31/3,993.80 = 929.94/x
3. Step 3: Cross multiply
   2,661.31x = 3,993.80 × 929.94
4. Step 4: Simplify right side
   2,661.31x = 3,713,986.71
5. Step 5: Solve for x
   x = 3,713,986.71/2,661.31
6. Step 6: Final answer
   x = 1,395.55