Finding the Third Proportional to 138,887 and 298,870

Step by Step Solution

1. Step 1: Write the proportion equation
   138,887 : 298,870 = 298,870 : x
2. Step 2: Convert to fraction form
   138,887/298,870 = 298,870/x
3. Step 3: Cross multiply
   138,887x = 298,870 × 298,870
4. Step 4: Simplify right side
   138,887x = 89,323,276,900
5. Step 5: Solve for x
   x = 89,323,276,900/138,887
6. Step 6: Final answer
   x = 643,136.34