Finding the Fourth Proportional to 844.31, 1,264.72 and 782.80

Step by Step Solution

1. Step 1: Write the proportion equation
   844.31 : 1,264.72 = 782.80 : x
2. Step 2: Convert to fraction form
   844.31/1,264.72 = 782.80/x
3. Step 3: Cross multiply
   844.31x = 1,264.72 × 782.80
4. Step 4: Simplify right side
   844.31x = 990,022.82
5. Step 5: Solve for x
   x = 990,022.82/844.31
6. Step 6: Final answer
   x = 1,172.58