Finding the Third Proportional to 64,987 and 139,646

Step by Step Solution

1. Step 1: Write the proportion equation
   64,987 : 139,646 = 139,646 : x
2. Step 2: Convert to fraction form
   64,987/139,646 = 139,646/x
3. Step 3: Cross multiply
   64,987x = 139,646 × 139,646
4. Step 4: Simplify right side
   64,987x = 19,501,005,316
5. Step 5: Solve for x
   x = 19,501,005,316/64,987
6. Step 6: Final answer
   x = 300,075.48