Finding the Third Proportional to 57,638.25 and 90,220.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,638.25 : 90,220.50 = 90,220.50 : x
2. Step 2: Convert to fraction form
   57,638.25/90,220.50 = 90,220.50/x
3. Step 3: Cross multiply
   57,638.25x = 90,220.50 × 90,220.50
4. Step 4: Simplify right side
   57,638.25x = 8,139,738,620.25
5. Step 5: Solve for x
   x = 8,139,738,620.25/57,638.25
6. Step 6: Final answer
   x = 141,221.13