Finding the Third Proportional to 148,354.50 and 318,828

Step by Step Solution

1. Step 1: Write the proportion equation
   148,354.50 : 318,828 = 318,828 : x
2. Step 2: Convert to fraction form
   148,354.50/318,828 = 318,828/x
3. Step 3: Cross multiply
   148,354.50x = 318,828 × 318,828
4. Step 4: Simplify right side
   148,354.50x = 101,651,293,584
5. Step 5: Solve for x
   x = 101,651,293,584/148,354.50
6. Step 6: Final answer
   x = 685,191.85