Finding the Third Proportional to 305,980.50 and 654,061.50

Step by Step Solution

1. Step 1: Write the proportion equation
   305,980.50 : 654,061.50 = 654,061.50 : x
2. Step 2: Convert to fraction form
   305,980.50/654,061.50 = 654,061.50/x
3. Step 3: Cross multiply
   305,980.50x = 654,061.50 × 654,061.50
4. Step 4: Simplify right side
   305,980.50x = 427,796,445,782.25
5. Step 5: Solve for x
   x = 427,796,445,782.25/305,980.50
6. Step 6: Final answer
   x = 1,398,116.70