Finding the Third Proportional to 143,803.50 and 309,682.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,803.50 : 309,682.50 = 309,682.50 : x
2. Step 2: Convert to fraction form
   143,803.50/309,682.50 = 309,682.50/x
3. Step 3: Cross multiply
   143,803.50x = 309,682.50 × 309,682.50
4. Step 4: Simplify right side
   143,803.50x = 95,903,250,806.25
5. Step 5: Solve for x
   x = 95,903,250,806.25/143,803.50
6. Step 6: Final answer
   x = 666,904.84