Finding the Fourth Proportional to 1,009.64, 1,393.32 and 555.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.64 : 1,393.32 = 555.42 : x
2. Step 2: Convert to fraction form
   1,009.64/1,393.32 = 555.42/x
3. Step 3: Cross multiply
   1,009.64x = 1,393.32 × 555.42
4. Step 4: Simplify right side
   1,009.64x = 773,870.22
5. Step 5: Solve for x
   x = 773,870.22/1,009.64
6. Step 6: Final answer
   x = 766.48