Finding the Third Proportional to 148,078.69 and 319,798.69

Step by Step Solution

1. Step 1: Write the proportion equation
   148,078.69 : 319,798.69 = 319,798.69 : x
2. Step 2: Convert to fraction form
   148,078.69/319,798.69 = 319,798.69/x
3. Step 3: Cross multiply
   148,078.69x = 319,798.69 × 319,798.69
4. Step 4: Simplify right side
   148,078.69x = 102,271,200,526.72
5. Step 5: Solve for x
   x = 102,271,200,526.72/148,078.69
6. Step 6: Final answer
   x = 690,654.42