Finding the Third Proportional to 139,938.75 and 301,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,938.75 : 301,990.50 = 301,990.50 : x
2. Step 2: Convert to fraction form
   139,938.75/301,990.50 = 301,990.50/x
3. Step 3: Cross multiply
   139,938.75x = 301,990.50 × 301,990.50
4. Step 4: Simplify right side
   139,938.75x = 91,198,262,090.25
5. Step 5: Solve for x
   x = 91,198,262,090.25/139,938.75
6. Step 6: Final answer
   x = 651,701.28