Finding the Third Proportional to 139,938.75 and 210,915

Step by Step Solution

1. Step 1: Write the proportion equation
   139,938.75 : 210,915 = 210,915 : x
2. Step 2: Convert to fraction form
   139,938.75/210,915 = 210,915/x
3. Step 3: Cross multiply
   139,938.75x = 210,915 × 210,915
4. Step 4: Simplify right side
   139,938.75x = 44,485,137,225
5. Step 5: Solve for x
   x = 44,485,137,225/139,938.75
6. Step 6: Final answer
   x = 317,890.06