Finding the Third Proportional to 87,547.50 and 128,216.25

Step by Step Solution

1. Step 1: Write the proportion equation
   87,547.50 : 128,216.25 = 128,216.25 : x
2. Step 2: Convert to fraction form
   87,547.50/128,216.25 = 128,216.25/x
3. Step 3: Cross multiply
   87,547.50x = 128,216.25 × 128,216.25
4. Step 4: Simplify right side
   87,547.50x = 16,439,406,764.06
5. Step 5: Solve for x
   x = 16,439,406,764.06/87,547.50
6. Step 6: Final answer
   x = 187,777.00