Finding the Third Proportional to 139,492 and 286,328

Step by Step Solution

1. Step 1: Write the proportion equation
   139,492 : 286,328 = 286,328 : x
2. Step 2: Convert to fraction form
   139,492/286,328 = 286,328/x
3. Step 3: Cross multiply
   139,492x = 286,328 × 286,328
4. Step 4: Simplify right side
   139,492x = 81,983,723,584
5. Step 5: Solve for x
   x = 81,983,723,584/139,492
6. Step 6: Final answer
   x = 587,730.65