Finding the Fourth Proportional to 1,225.33, 1,690.27 and 782.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.33 : 1,690.27 = 782.46 : x
2. Step 2: Convert to fraction form
   1,225.33/1,690.27 = 782.46/x
3. Step 3: Cross multiply
   1,225.33x = 1,690.27 × 782.46
4. Step 4: Simplify right side
   1,225.33x = 1,322,566.71
5. Step 5: Solve for x
   x = 1,322,566.71/1,225.33
6. Step 6: Final answer
   x = 1,079.36