Finding the Third Proportional to 153,700.50 and 315,055.50

Step by Step Solution

1. Step 1: Write the proportion equation
   153,700.50 : 315,055.50 = 315,055.50 : x
2. Step 2: Convert to fraction form
   153,700.50/315,055.50 = 315,055.50/x
3. Step 3: Cross multiply
   153,700.50x = 315,055.50 × 315,055.50
4. Step 4: Simplify right side
   153,700.50x = 99,259,968,080.25
5. Step 5: Solve for x
   x = 99,259,968,080.25/153,700.50
6. Step 6: Final answer
   x = 645,801.20