Finding the Third Proportional to 143,417.53 and 315,144.56

Step by Step Solution

1. Step 1: Write the proportion equation
   143,417.53 : 315,144.56 = 315,144.56 : x
2. Step 2: Convert to fraction form
   143,417.53/315,144.56 = 315,144.56/x
3. Step 3: Cross multiply
   143,417.53x = 315,144.56 × 315,144.56
4. Step 4: Simplify right side
   143,417.53x = 99,316,095,273.32
5. Step 5: Solve for x
   x = 99,316,095,273.32/143,417.53
6. Step 6: Final answer
   x = 692,496.20