Finding the Fourth Proportional to 1,009.32, 1,392.87 and 555.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.32 : 1,392.87 = 555.09 : x
2. Step 2: Convert to fraction form
   1,009.32/1,392.87 = 555.09/x
3. Step 3: Cross multiply
   1,009.32x = 1,392.87 × 555.09
4. Step 4: Simplify right side
   1,009.32x = 773,168.90
5. Step 5: Solve for x
   x = 773,168.90/1,009.32
6. Step 6: Final answer
   x = 766.03