Finding the Third Proportional to 87,615 and 128,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,615 : 128,308.50 = 128,308.50 : x
2. Step 2: Convert to fraction form
   87,615/128,308.50 = 128,308.50/x
3. Step 3: Cross multiply
   87,615x = 128,308.50 × 128,308.50
4. Step 4: Simplify right side
   87,615x = 16,463,071,172.25
5. Step 5: Solve for x
   x = 16,463,071,172.25/87,615
6. Step 6: Final answer
   x = 187,902.43