Finding the Fourth Proportional to 1,018.17, 1,404.54 and 624.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.17 : 1,404.54 = 624.51 : x
2. Step 2: Convert to fraction form
   1,018.17/1,404.54 = 624.51/x
3. Step 3: Cross multiply
   1,018.17x = 1,404.54 × 624.51
4. Step 4: Simplify right side
   1,018.17x = 877,149.28
5. Step 5: Solve for x
   x = 877,149.28/1,018.17
6. Step 6: Final answer
   x = 861.50