Finding the Third Proportional to 21,386.25 and 51,521.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,386.25 : 51,521.63 = 51,521.63 : x
2. Step 2: Convert to fraction form
   21,386.25/51,521.63 = 51,521.63/x
3. Step 3: Cross multiply
   21,386.25x = 51,521.63 × 51,521.63
4. Step 4: Simplify right side
   21,386.25x = 2,654,477,842.64
5. Step 5: Solve for x
   x = 2,654,477,842.64/21,386.25
6. Step 6: Final answer
   x = 124,120.77