Finding the Third Proportional to 63,784.50 and 139,688

Step by Step Solution

1. Step 1: Write the proportion equation
   63,784.50 : 139,688 = 139,688 : x
2. Step 2: Convert to fraction form
   63,784.50/139,688 = 139,688/x
3. Step 3: Cross multiply
   63,784.50x = 139,688 × 139,688
4. Step 4: Simplify right side
   63,784.50x = 19,512,737,344
5. Step 5: Solve for x
   x = 19,512,737,344/63,784.50
6. Step 6: Final answer
   x = 305,916.60