Finding the Third Proportional to 139,916.25 and 299,776.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,916.25 : 299,776.50 = 299,776.50 : x
2. Step 2: Convert to fraction form
   139,916.25/299,776.50 = 299,776.50/x
3. Step 3: Cross multiply
   139,916.25x = 299,776.50 × 299,776.50
4. Step 4: Simplify right side
   139,916.25x = 89,865,949,952.25
5. Step 5: Solve for x
   x = 89,865,949,952.25/139,916.25
6. Step 6: Final answer
   x = 642,283.87