Finding the Third Proportional to 61,215.75 and 87,631.88

Step by Step Solution

1. Step 1: Write the proportion equation
   61,215.75 : 87,631.88 = 87,631.88 : x
2. Step 2: Convert to fraction form
   61,215.75/87,631.88 = 87,631.88/x
3. Step 3: Cross multiply
   61,215.75x = 87,631.88 × 87,631.88
4. Step 4: Simplify right side
   61,215.75x = 7,679,345,516.02
5. Step 5: Solve for x
   x = 7,679,345,516.02/61,215.75
6. Step 6: Final answer
   x = 125,447.22