Finding the Third Proportional to 42,131 and 90,459

Step by Step Solution

1. Step 1: Write the proportion equation
   42,131 : 90,459 = 90,459 : x
2. Step 2: Convert to fraction form
   42,131/90,459 = 90,459/x
3. Step 3: Cross multiply
   42,131x = 90,459 × 90,459
4. Step 4: Simplify right side
   42,131x = 8,182,830,681
5. Step 5: Solve for x
   x = 8,182,830,681/42,131
6. Step 6: Final answer
   x = 194,223.51