Finding the Fourth Proportional to 1,009.33, 1,392.86 and 561.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.33 : 1,392.86 = 561.20 : x
2. Step 2: Convert to fraction form
   1,009.33/1,392.86 = 561.20/x
3. Step 3: Cross multiply
   1,009.33x = 1,392.86 × 561.20
4. Step 4: Simplify right side
   1,009.33x = 781,667.47
5. Step 5: Solve for x
   x = 781,667.47/1,009.33
6. Step 6: Final answer
   x = 774.44