Finding the Third Proportional to 143,087.50 and 310,758.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,087.50 : 310,758.50 = 310,758.50 : x
2. Step 2: Convert to fraction form
   143,087.50/310,758.50 = 310,758.50/x
3. Step 3: Cross multiply
   143,087.50x = 310,758.50 × 310,758.50
4. Step 4: Simplify right side
   143,087.50x = 96,570,845,322.25
5. Step 5: Solve for x
   x = 96,570,845,322.25/143,087.50
6. Step 6: Final answer
   x = 674,907.63