Finding the Third Proportional to 18,871.31 and 38,561.91

Step by Step Solution

1. Step 1: Write the proportion equation
   18,871.31 : 38,561.91 = 38,561.91 : x
2. Step 2: Convert to fraction form
   18,871.31/38,561.91 = 38,561.91/x
3. Step 3: Cross multiply
   18,871.31x = 38,561.91 × 38,561.91
4. Step 4: Simplify right side
   18,871.31x = 1,487,020,613.63
5. Step 5: Solve for x
   x = 1,487,020,613.63/18,871.31
6. Step 6: Final answer
   x = 78,797.94