Finding the Fourth Proportional to 931.50, 1,398.47 and 624.72

Step by Step Solution

1. Step 1: Write the proportion equation
   931.50 : 1,398.47 = 624.72 : x
2. Step 2: Convert to fraction form
   931.50/1,398.47 = 624.72/x
3. Step 3: Cross multiply
   931.50x = 1,398.47 × 624.72
4. Step 4: Simplify right side
   931.50x = 873,650.37
5. Step 5: Solve for x
   x = 873,650.37/931.50
6. Step 6: Final answer
   x = 937.90