Finding the Third Proportional to 57,321.75 and 64,429.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,321.75 : 64,429.50 = 64,429.50 : x
2. Step 2: Convert to fraction form
   57,321.75/64,429.50 = 64,429.50/x
3. Step 3: Cross multiply
   57,321.75x = 64,429.50 × 64,429.50
4. Step 4: Simplify right side
   57,321.75x = 4,151,160,470.25
5. Step 5: Solve for x
   x = 4,151,160,470.25/57,321.75
6. Step 6: Final answer
   x = 72,418.59