Finding the Third Proportional to 56,821.50 and 89,138.25

Step by Step Solution

1. Step 1: Write the proportion equation
   56,821.50 : 89,138.25 = 89,138.25 : x
2. Step 2: Convert to fraction form
   56,821.50/89,138.25 = 89,138.25/x
3. Step 3: Cross multiply
   56,821.50x = 89,138.25 × 89,138.25
4. Step 4: Simplify right side
   56,821.50x = 7,945,627,613.06
5. Step 5: Solve for x
   x = 7,945,627,613.06/56,821.50
6. Step 6: Final answer
   x = 139,834.88