Finding the Fourth Proportional to 1,003.47, 1,384.78 and 555.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.47 : 1,384.78 = 555.37 : x
2. Step 2: Convert to fraction form
   1,003.47/1,384.78 = 555.37/x
3. Step 3: Cross multiply
   1,003.47x = 1,384.78 × 555.37
4. Step 4: Simplify right side
   1,003.47x = 769,065.27
5. Step 5: Solve for x
   x = 769,065.27/1,003.47
6. Step 6: Final answer
   x = 766.41