Finding the Third Proportional to 139,867.50 and 210,963

Step by Step Solution

1. Step 1: Write the proportion equation
   139,867.50 : 210,963 = 210,963 : x
2. Step 2: Convert to fraction form
   139,867.50/210,963 = 210,963/x
3. Step 3: Cross multiply
   139,867.50x = 210,963 × 210,963
4. Step 4: Simplify right side
   139,867.50x = 44,505,387,369
5. Step 5: Solve for x
   x = 44,505,387,369/139,867.50
6. Step 6: Final answer
   x = 318,196.77