Finding the Fourth Proportional to 1,003.31, 1,384.79 and 738.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.31 : 1,384.79 = 738.12 : x
2. Step 2: Convert to fraction form
   1,003.31/1,384.79 = 738.12/x
3. Step 3: Cross multiply
   1,003.31x = 1,384.79 × 738.12
4. Step 4: Simplify right side
   1,003.31x = 1,022,137.50
5. Step 5: Solve for x
   x = 1,022,137.50/1,003.31
6. Step 6: Final answer
   x = 1,018.77