Finding the Fourth Proportional to 1,007.49, 1,513.35 and 617.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.49 : 1,513.35 = 617.67 : x
2. Step 2: Convert to fraction form
   1,007.49/1,513.35 = 617.67/x
3. Step 3: Cross multiply
   1,007.49x = 1,513.35 × 617.67
4. Step 4: Simplify right side
   1,007.49x = 934,750.89
5. Step 5: Solve for x
   x = 934,750.89/1,007.49
6. Step 6: Final answer
   x = 927.80