Finding the Third Proportional to 139,522.50 and 208,971

Step by Step Solution

1. Step 1: Write the proportion equation
   139,522.50 : 208,971 = 208,971 : x
2. Step 2: Convert to fraction form
   139,522.50/208,971 = 208,971/x
3. Step 3: Cross multiply
   139,522.50x = 208,971 × 208,971
4. Step 4: Simplify right side
   139,522.50x = 43,668,878,841
5. Step 5: Solve for x
   x = 43,668,878,841/139,522.50
6. Step 6: Final answer
   x = 312,988.08