Finding the Third Proportional to 147,390 and 315,806.25

Step by Step Solution

1. Step 1: Write the proportion equation
   147,390 : 315,806.25 = 315,806.25 : x
2. Step 2: Convert to fraction form
   147,390/315,806.25 = 315,806.25/x
3. Step 3: Cross multiply
   147,390x = 315,806.25 × 315,806.25
4. Step 4: Simplify right side
   147,390x = 99,733,587,539.06
5. Step 5: Solve for x
   x = 99,733,587,539.06/147,390
6. Step 6: Final answer
   x = 676,664.55