Finding the Fourth Proportional to 1,409.90, 2,112.83 and 792.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.90 : 2,112.83 = 792.31 : x
2. Step 2: Convert to fraction form
   1,409.90/2,112.83 = 792.31/x
3. Step 3: Cross multiply
   1,409.90x = 2,112.83 × 792.31
4. Step 4: Simplify right side
   1,409.90x = 1,674,016.34
5. Step 5: Solve for x
   x = 1,674,016.34/1,409.90
6. Step 6: Final answer
   x = 1,187.33