Finding the Fourth Proportional to 1,017.56, 1,404.34 and 624.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.56 : 1,404.34 = 624.51 : x
2. Step 2: Convert to fraction form
   1,017.56/1,404.34 = 624.51/x
3. Step 3: Cross multiply
   1,017.56x = 1,404.34 × 624.51
4. Step 4: Simplify right side
   1,017.56x = 877,022.81
5. Step 5: Solve for x
   x = 877,022.81/1,017.56
6. Step 6: Final answer
   x = 861.89