Finding the Third Proportional to 64,894.50 and 139,131

Step by Step Solution

1. Step 1: Write the proportion equation
   64,894.50 : 139,131 = 139,131 : x
2. Step 2: Convert to fraction form
   64,894.50/139,131 = 139,131/x
3. Step 3: Cross multiply
   64,894.50x = 139,131 × 139,131
4. Step 4: Simplify right side
   64,894.50x = 19,357,435,161
5. Step 5: Solve for x
   x = 19,357,435,161/64,894.50
6. Step 6: Final answer
   x = 298,290.84