Finding the Fourth Proportional to 1,002.98, 1,383.89 and 624.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.98 : 1,383.89 = 624.81 : x
2. Step 2: Convert to fraction form
   1,002.98/1,383.89 = 624.81/x
3. Step 3: Cross multiply
   1,002.98x = 1,383.89 × 624.81
4. Step 4: Simplify right side
   1,002.98x = 864,670.38
5. Step 5: Solve for x
   x = 864,670.38/1,002.98
6. Step 6: Final answer
   x = 862.10