Finding the Third Proportional to 138,712.50 and 298,476

Step by Step Solution

1. Step 1: Write the proportion equation
   138,712.50 : 298,476 = 298,476 : x
2. Step 2: Convert to fraction form
   138,712.50/298,476 = 298,476/x
3. Step 3: Cross multiply
   138,712.50x = 298,476 × 298,476
4. Step 4: Simplify right side
   138,712.50x = 89,087,922,576
5. Step 5: Solve for x
   x = 89,087,922,576/138,712.50
6. Step 6: Final answer
   x = 642,248.70