Finding the Third Proportional to 57,718 and 90,221

Step by Step Solution

1. Step 1: Write the proportion equation
   57,718 : 90,221 = 90,221 : x
2. Step 2: Convert to fraction form
   57,718/90,221 = 90,221/x
3. Step 3: Cross multiply
   57,718x = 90,221 × 90,221
4. Step 4: Simplify right side
   57,718x = 8,139,828,841
5. Step 5: Solve for x
   x = 8,139,828,841/57,718
6. Step 6: Final answer
   x = 141,027.56