Finding the Third Proportional to 18,961.31 and 42,131.25

Step by Step Solution

1. Step 1: Write the proportion equation
   18,961.31 : 42,131.25 = 42,131.25 : x
2. Step 2: Convert to fraction form
   18,961.31/42,131.25 = 42,131.25/x
3. Step 3: Cross multiply
   18,961.31x = 42,131.25 × 42,131.25
4. Step 4: Simplify right side
   18,961.31x = 1,775,042,226.56
5. Step 5: Solve for x
   x = 1,775,042,226.56/18,961.31
6. Step 6: Final answer
   x = 93,613.89