Finding the Fourth Proportional to 1,009.25, 1,392.69 and 561.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.25 : 1,392.69 = 561.07 : x
2. Step 2: Convert to fraction form
   1,009.25/1,392.69 = 561.07/x
3. Step 3: Cross multiply
   1,009.25x = 1,392.69 × 561.07
4. Step 4: Simplify right side
   1,009.25x = 781,396.58
5. Step 5: Solve for x
   x = 781,396.58/1,009.25
6. Step 6: Final answer
   x = 774.23