Finding the Third Proportional to 59,078.81 and 90,808.31

Step by Step Solution

1. Step 1: Write the proportion equation
   59,078.81 : 90,808.31 = 90,808.31 : x
2. Step 2: Convert to fraction form
   59,078.81/90,808.31 = 90,808.31/x
3. Step 3: Cross multiply
   59,078.81x = 90,808.31 × 90,808.31
4. Step 4: Simplify right side
   59,078.81x = 8,246,149,619.10
5. Step 5: Solve for x
   x = 8,246,149,619.10/59,078.81
6. Step 6: Final answer
   x = 139,578.80