Finding the Third Proportional to 42,139 and 90,276

Step by Step Solution

1. Step 1: Write the proportion equation
   42,139 : 90,276 = 90,276 : x
2. Step 2: Convert to fraction form
   42,139/90,276 = 90,276/x
3. Step 3: Cross multiply
   42,139x = 90,276 × 90,276
4. Step 4: Simplify right side
   42,139x = 8,149,756,176
5. Step 5: Solve for x
   x = 8,149,756,176/42,139
6. Step 6: Final answer
   x = 193,401.75