Finding the Third Proportional to 4,505.91 and 9,889.31

Step by Step Solution

1. Step 1: Write the proportion equation
   4,505.91 : 9,889.31 = 9,889.31 : x
2. Step 2: Convert to fraction form
   4,505.91/9,889.31 = 9,889.31/x
3. Step 3: Cross multiply
   4,505.91x = 9,889.31 × 9,889.31
4. Step 4: Simplify right side
   4,505.91x = 97,798,501.72
5. Step 5: Solve for x
   x = 97,798,501.72/4,505.91
6. Step 6: Final answer
   x = 21,704.51