Finding the Third Proportional to 83,890.50 and 129,607.50

Step by Step Solution

1. Step 1: Write the proportion equation
   83,890.50 : 129,607.50 = 129,607.50 : x
2. Step 2: Convert to fraction form
   83,890.50/129,607.50 = 129,607.50/x
3. Step 3: Cross multiply
   83,890.50x = 129,607.50 × 129,607.50
4. Step 4: Simplify right side
   83,890.50x = 16,798,104,056.25
5. Step 5: Solve for x
   x = 16,798,104,056.25/83,890.50
6. Step 6: Final answer
   x = 200,238.45