Finding the Third Proportional to 918.50 and 1,392

Step by Step Solution

1. Step 1: Write the proportion equation
   918.50 : 1,392 = 1,392 : x
2. Step 2: Convert to fraction form
   918.50/1,392 = 1,392/x
3. Step 3: Cross multiply
   918.50x = 1,392 × 1,392
4. Step 4: Simplify right side
   918.50x = 1,937,664
5. Step 5: Solve for x
   x = 1,937,664/918.50
6. Step 6: Final answer
   x = 2,109.60