Finding the Fourth Proportional to 1,411.65, 1,947.11 and 992.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.65 : 1,947.11 = 992.88 : x
2. Step 2: Convert to fraction form
   1,411.65/1,947.11 = 992.88/x
3. Step 3: Cross multiply
   1,411.65x = 1,947.11 × 992.88
4. Step 4: Simplify right side
   1,411.65x = 1,933,241.61
5. Step 5: Solve for x
   x = 1,933,241.61/1,411.65
6. Step 6: Final answer
   x = 1,369.49