Finding the Fourth Proportional to 1,018.50, 1,528.53 and 745.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.50 : 1,528.53 = 745.30 : x
2. Step 2: Convert to fraction form
   1,018.50/1,528.53 = 745.30/x
3. Step 3: Cross multiply
   1,018.50x = 1,528.53 × 745.30
4. Step 4: Simplify right side
   1,018.50x = 1,139,208.21
5. Step 5: Solve for x
   x = 1,139,208.21/1,018.50
6. Step 6: Final answer
   x = 1,118.51