Finding the Third Proportional to 61,615 and 89,020.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,615 : 89,020.50 = 89,020.50 : x
2. Step 2: Convert to fraction form
   61,615/89,020.50 = 89,020.50/x
3. Step 3: Cross multiply
   61,615x = 89,020.50 × 89,020.50
4. Step 4: Simplify right side
   61,615x = 7,924,649,420.25
5. Step 5: Solve for x
   x = 7,924,649,420.25/61,615
6. Step 6: Final answer
   x = 128,615.59