Finding the Third Proportional to 21,240 and 57,784.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,240 : 57,784.50 = 57,784.50 : x
2. Step 2: Convert to fraction form
   21,240/57,784.50 = 57,784.50/x
3. Step 3: Cross multiply
   21,240x = 57,784.50 × 57,784.50
4. Step 4: Simplify right side
   21,240x = 3,339,048,440.25
5. Step 5: Solve for x
   x = 3,339,048,440.25/21,240
6. Step 6: Final answer
   x = 157,205.67