Finding the Fourth Proportional to 1,002.98, 1,502.69 and 612.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.98 : 1,502.69 = 612.79 : x
2. Step 2: Convert to fraction form
   1,002.98/1,502.69 = 612.79/x
3. Step 3: Cross multiply
   1,002.98x = 1,502.69 × 612.79
4. Step 4: Simplify right side
   1,002.98x = 920,826.58
5. Step 5: Solve for x
   x = 920,826.58/1,002.98
6. Step 6: Final answer
   x = 918.09