Finding the Third Proportional to 69,390 and 148,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   69,390 : 148,618.50 = 148,618.50 : x
2. Step 2: Convert to fraction form
   69,390/148,618.50 = 148,618.50/x
3. Step 3: Cross multiply
   69,390x = 148,618.50 × 148,618.50
4. Step 4: Simplify right side
   69,390x = 22,087,458,542.25
5. Step 5: Solve for x
   x = 22,087,458,542.25/69,390
6. Step 6: Final answer
   x = 318,308.96