Finding the Fourth Proportional to 1,991.40, 2,987.69 and 804.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.40 : 2,987.69 = 804.82 : x
2. Step 2: Convert to fraction form
   1,991.40/2,987.69 = 804.82/x
3. Step 3: Cross multiply
   1,991.40x = 2,987.69 × 804.82
4. Step 4: Simplify right side
   1,991.40x = 2,404,552.67
5. Step 5: Solve for x
   x = 2,404,552.67/1,991.40
6. Step 6: Final answer
   x = 1,207.47