Finding the Third Proportional to 258,134.34 and 371,790

Step by Step Solution

1. Step 1: Write the proportion equation
   258,134.34 : 371,790 = 371,790 : x
2. Step 2: Convert to fraction form
   258,134.34/371,790 = 371,790/x
3. Step 3: Cross multiply
   258,134.34x = 371,790 × 371,790
4. Step 4: Simplify right side
   258,134.34x = 138,227,804,100
5. Step 5: Solve for x
   x = 138,227,804,100/258,134.34
6. Step 6: Final answer
   x = 535,487.85