Finding the Third Proportional to 139,488 and 286,320

Step by Step Solution

1. Step 1: Write the proportion equation
   139,488 : 286,320 = 286,320 : x
2. Step 2: Convert to fraction form
   139,488/286,320 = 286,320/x
3. Step 3: Cross multiply
   139,488x = 286,320 × 286,320
4. Step 4: Simplify right side
   139,488x = 81,979,142,400
5. Step 5: Solve for x
   x = 81,979,142,400/139,488
6. Step 6: Final answer
   x = 587,714.66