Finding the Third Proportional to 64,898 and 139,140

Step by Step Solution

1. Step 1: Write the proportion equation
   64,898 : 139,140 = 139,140 : x
2. Step 2: Convert to fraction form
   64,898/139,140 = 139,140/x
3. Step 3: Cross multiply
   64,898x = 139,140 × 139,140
4. Step 4: Simplify right side
   64,898x = 19,359,939,600
5. Step 5: Solve for x
   x = 19,359,939,600/64,898
6. Step 6: Final answer
   x = 298,313.35