Finding the Third Proportional to 64,902 and 139,143

Step by Step Solution

1. Step 1: Write the proportion equation
   64,902 : 139,143 = 139,143 : x
2. Step 2: Convert to fraction form
   64,902/139,143 = 139,143/x
3. Step 3: Cross multiply
   64,902x = 139,143 × 139,143
4. Step 4: Simplify right side
   64,902x = 19,360,774,449
5. Step 5: Solve for x
   x = 19,360,774,449/64,902
6. Step 6: Final answer
   x = 298,307.82