Finding the Third Proportional to 59,101.50 and 90,420.75

Step by Step Solution

1. Step 1: Write the proportion equation
   59,101.50 : 90,420.75 = 90,420.75 : x
2. Step 2: Convert to fraction form
   59,101.50/90,420.75 = 90,420.75/x
3. Step 3: Cross multiply
   59,101.50x = 90,420.75 × 90,420.75
4. Step 4: Simplify right side
   59,101.50x = 8,175,912,030.56
5. Step 5: Solve for x
   x = 8,175,912,030.56/59,101.50
6. Step 6: Final answer
   x = 138,336.79