Finding the Third Proportional to 61,921 and 89,857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,921 : 89,857.50 = 89,857.50 : x
2. Step 2: Convert to fraction form
   61,921/89,857.50 = 89,857.50/x
3. Step 3: Cross multiply
   61,921x = 89,857.50 × 89,857.50
4. Step 4: Simplify right side
   61,921x = 8,074,370,306.25
5. Step 5: Solve for x
   x = 8,074,370,306.25/61,921
6. Step 6: Final answer
   x = 130,397.93