Finding the Third Proportional to 64,521 and 139,248

Step by Step Solution

1. Step 1: Write the proportion equation
   64,521 : 139,248 = 139,248 : x
2. Step 2: Convert to fraction form
   64,521/139,248 = 139,248/x
3. Step 3: Cross multiply
   64,521x = 139,248 × 139,248
4. Step 4: Simplify right side
   64,521x = 19,390,005,504
5. Step 5: Solve for x
   x = 19,390,005,504/64,521
6. Step 6: Final answer
   x = 300,522.40