Finding the Fourth Proportional to 1,322.79, 1,826.06 and 992.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,322.79 : 1,826.06 = 992.31 : x
2. Step 2: Convert to fraction form
   1,322.79/1,826.06 = 992.31/x
3. Step 3: Cross multiply
   1,322.79x = 1,826.06 × 992.31
4. Step 4: Simplify right side
   1,322.79x = 1,812,012.64
5. Step 5: Solve for x
   x = 1,812,012.64/1,322.79
6. Step 6: Final answer
   x = 1,369.84