Finding the Third Proportional to 65,638.50 and 143,985

Step by Step Solution

1. Step 1: Write the proportion equation
   65,638.50 : 143,985 = 143,985 : x
2. Step 2: Convert to fraction form
   65,638.50/143,985 = 143,985/x
3. Step 3: Cross multiply
   65,638.50x = 143,985 × 143,985
4. Step 4: Simplify right side
   65,638.50x = 20,731,680,225
5. Step 5: Solve for x
   x = 20,731,680,225/65,638.50
6. Step 6: Final answer
   x = 315,846.34