Finding the Third Proportional to 139,248 and 285,870

Step by Step Solution

1. Step 1: Write the proportion equation
   139,248 : 285,870 = 285,870 : x
2. Step 2: Convert to fraction form
   139,248/285,870 = 285,870/x
3. Step 3: Cross multiply
   139,248x = 285,870 × 285,870
4. Step 4: Simplify right side
   139,248x = 81,721,656,900
5. Step 5: Solve for x
   x = 81,721,656,900/139,248
6. Step 6: Final answer
   x = 586,878.50