Finding the Fourth Proportional to 2,661.48, 3,991.86 and 929.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.48 : 3,991.86 = 929.88 : x
2. Step 2: Convert to fraction form
   2,661.48/3,991.86 = 929.88/x
3. Step 3: Cross multiply
   2,661.48x = 3,991.86 × 929.88
4. Step 4: Simplify right side
   2,661.48x = 3,711,950.78
5. Step 5: Solve for x
   x = 3,711,950.78/2,661.48
6. Step 6: Final answer
   x = 1,394.69