Finding the Third Proportional to 915.50 and 1,224

Step by Step Solution

1. Step 1: Write the proportion equation
   915.50 : 1,224 = 1,224 : x
2. Step 2: Convert to fraction form
   915.50/1,224 = 1,224/x
3. Step 3: Cross multiply
   915.50x = 1,224 × 1,224
4. Step 4: Simplify right side
   915.50x = 1,498,176
5. Step 5: Solve for x
   x = 1,498,176/915.50
6. Step 6: Final answer
   x = 1,636.46