Finding the Third Proportional to 61,621.50 and 89,029.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,621.50 : 89,029.50 = 89,029.50 : x
2. Step 2: Convert to fraction form
   61,621.50/89,029.50 = 89,029.50/x
3. Step 3: Cross multiply
   61,621.50x = 89,029.50 × 89,029.50
4. Step 4: Simplify right side
   61,621.50x = 7,926,251,870.25
5. Step 5: Solve for x
   x = 7,926,251,870.25/61,621.50
6. Step 6: Final answer
   x = 128,628.03