Finding the Third Proportional to 139,435.50 and 286,287

Step by Step Solution

1. Step 1: Write the proportion equation
   139,435.50 : 286,287 = 286,287 : x
2. Step 2: Convert to fraction form
   139,435.50/286,287 = 286,287/x
3. Step 3: Cross multiply
   139,435.50x = 286,287 × 286,287
4. Step 4: Simplify right side
   139,435.50x = 81,960,246,369
5. Step 5: Solve for x
   x = 81,960,246,369/139,435.50
6. Step 6: Final answer
   x = 587,800.43