Finding the Third Proportional to 42,619.50 and 89,641.69

Step by Step Solution

1. Step 1: Write the proportion equation
   42,619.50 : 89,641.69 = 89,641.69 : x
2. Step 2: Convert to fraction form
   42,619.50/89,641.69 = 89,641.69/x
3. Step 3: Cross multiply
   42,619.50x = 89,641.69 × 89,641.69
4. Step 4: Simplify right side
   42,619.50x = 8,035,632,137.85
5. Step 5: Solve for x
   x = 8,035,632,137.85/42,619.50
6. Step 6: Final answer
   x = 188,543.56