Finding the Third Proportional to 131,688 and 288,360

Step by Step Solution

1. Step 1: Write the proportion equation
   131,688 : 288,360 = 288,360 : x
2. Step 2: Convert to fraction form
   131,688/288,360 = 288,360/x
3. Step 3: Cross multiply
   131,688x = 288,360 × 288,360
4. Step 4: Simplify right side
   131,688x = 83,151,489,600
5. Step 5: Solve for x
   x = 83,151,489,600/131,688
6. Step 6: Final answer
   x = 631,427.99