Finding the Third Proportional to 143,410.50 and 315,130.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,410.50 : 315,130.50 = 315,130.50 : x
2. Step 2: Convert to fraction form
   143,410.50/315,130.50 = 315,130.50/x
3. Step 3: Cross multiply
   143,410.50x = 315,130.50 × 315,130.50
4. Step 4: Simplify right side
   143,410.50x = 99,307,232,030.25
5. Step 5: Solve for x
   x = 99,307,232,030.25/143,410.50
6. Step 6: Final answer
   x = 692,468.35