Finding the Fourth Proportional to 1,003.82, 1,385.25 and 555.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.82 : 1,385.25 = 555.72 : x
2. Step 2: Convert to fraction form
   1,003.82/1,385.25 = 555.72/x
3. Step 3: Cross multiply
   1,003.82x = 1,385.25 × 555.72
4. Step 4: Simplify right side
   1,003.82x = 769,811.13
5. Step 5: Solve for x
   x = 769,811.13/1,003.82
6. Step 6: Final answer
   x = 766.89