Finding the Fourth Proportional to 1,019.48, 1,528.61 and 672.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.48 : 1,528.61 = 672.98 : x
2. Step 2: Convert to fraction form
   1,019.48/1,528.61 = 672.98/x
3. Step 3: Cross multiply
   1,019.48x = 1,528.61 × 672.98
4. Step 4: Simplify right side
   1,019.48x = 1,028,712.95
5. Step 5: Solve for x
   x = 1,028,712.95/1,019.48
6. Step 6: Final answer
   x = 1,009.06