Finding the Third Proportional to 57,406.13 and 90,511.31

Step by Step Solution

1. Step 1: Write the proportion equation
   57,406.13 : 90,511.31 = 90,511.31 : x
2. Step 2: Convert to fraction form
   57,406.13/90,511.31 = 90,511.31/x
3. Step 3: Cross multiply
   57,406.13x = 90,511.31 × 90,511.31
4. Step 4: Simplify right side
   57,406.13x = 8,192,297,690.47
5. Step 5: Solve for x
   x = 8,192,297,690.47/57,406.13
6. Step 6: Final answer
   x = 142,707.73