Finding the Third Proportional to 131,688 and 289,632

Step by Step Solution

1. Step 1: Write the proportion equation
   131,688 : 289,632 = 289,632 : x
2. Step 2: Convert to fraction form
   131,688/289,632 = 289,632/x
3. Step 3: Cross multiply
   131,688x = 289,632 × 289,632
4. Step 4: Simplify right side
   131,688x = 83,886,695,424
5. Step 5: Solve for x
   x = 83,886,695,424/131,688
6. Step 6: Final answer
   x = 637,010.93