Finding the Third Proportional to 11,687.63 and 30,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,687.63 : 30,688.50 = 30,688.50 : x
2. Step 2: Convert to fraction form
   11,687.63/30,688.50 = 30,688.50/x
3. Step 3: Cross multiply
   11,687.63x = 30,688.50 × 30,688.50
4. Step 4: Simplify right side
   11,687.63x = 941,784,032.25
5. Step 5: Solve for x
   x = 941,784,032.25/11,687.63
6. Step 6: Final answer
   x = 80,579.59