Finding the Third Proportional to 221,695.50 and 487,678

Step by Step Solution

1. Step 1: Write the proportion equation
   221,695.50 : 487,678 = 487,678 : x
2. Step 2: Convert to fraction form
   221,695.50/487,678 = 487,678/x
3. Step 3: Cross multiply
   221,695.50x = 487,678 × 487,678
4. Step 4: Simplify right side
   221,695.50x = 237,829,831,684
5. Step 5: Solve for x
   x = 237,829,831,684/221,695.50
6. Step 6: Final answer
   x = 1,072,776.99