Finding the Third Proportional to 42,390 and 90,576

Step by Step Solution

1. Step 1: Write the proportion equation
   42,390 : 90,576 = 90,576 : x
2. Step 2: Convert to fraction form
   42,390/90,576 = 90,576/x
3. Step 3: Cross multiply
   42,390x = 90,576 × 90,576
4. Step 4: Simplify right side
   42,390x = 8,204,011,776
5. Step 5: Solve for x
   x = 8,204,011,776/42,390
6. Step 6: Final answer
   x = 193,536.49