Finding the Third Proportional to 42,390 and 58,182

Step by Step Solution

1. Step 1: Write the proportion equation
   42,390 : 58,182 = 58,182 : x
2. Step 2: Convert to fraction form
   42,390/58,182 = 58,182/x
3. Step 3: Cross multiply
   42,390x = 58,182 × 58,182
4. Step 4: Simplify right side
   42,390x = 3,385,145,124
5. Step 5: Solve for x
   x = 3,385,145,124/42,390
6. Step 6: Final answer
   x = 79,857.16