Finding the Third Proportional to 138,749.63 and 298,215

Step by Step Solution

1. Step 1: Write the proportion equation
   138,749.63 : 298,215 = 298,215 : x
2. Step 2: Convert to fraction form
   138,749.63/298,215 = 298,215/x
3. Step 3: Cross multiply
   138,749.63x = 298,215 × 298,215
4. Step 4: Simplify right side
   138,749.63x = 88,932,186,225
5. Step 5: Solve for x
   x = 88,932,186,225/138,749.63
6. Step 6: Final answer
   x = 640,954.43