Finding the Third Proportional to 21,385 and 51,518.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,385 : 51,518.50 = 51,518.50 : x
2. Step 2: Convert to fraction form
   21,385/51,518.50 = 51,518.50/x
3. Step 3: Cross multiply
   21,385x = 51,518.50 × 51,518.50
4. Step 4: Simplify right side
   21,385x = 2,654,155,842.25
5. Step 5: Solve for x
   x = 2,654,155,842.25/21,385
6. Step 6: Final answer
   x = 124,112.97