Finding the Third Proportional to 148,128 and 318,733.50

Step by Step Solution

1. Step 1: Write the proportion equation
   148,128 : 318,733.50 = 318,733.50 : x
2. Step 2: Convert to fraction form
   148,128/318,733.50 = 318,733.50/x
3. Step 3: Cross multiply
   148,128x = 318,733.50 × 318,733.50
4. Step 4: Simplify right side
   148,128x = 101,591,044,022.25
5. Step 5: Solve for x
   x = 101,591,044,022.25/148,128
6. Step 6: Final answer
   x = 685,832.82