Finding the Third Proportional to 138,529.50 and 298,248

Step by Step Solution

1. Step 1: Write the proportion equation
   138,529.50 : 298,248 = 298,248 : x
2. Step 2: Convert to fraction form
   138,529.50/298,248 = 298,248/x
3. Step 3: Cross multiply
   138,529.50x = 298,248 × 298,248
4. Step 4: Simplify right side
   138,529.50x = 88,951,869,504
5. Step 5: Solve for x
   x = 88,951,869,504/138,529.50
6. Step 6: Final answer
   x = 642,115.00