Finding the Third Proportional to 21,368.81 and 51,819.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,368.81 : 51,819.75 = 51,819.75 : x
2. Step 2: Convert to fraction form
   21,368.81/51,819.75 = 51,819.75/x
3. Step 3: Cross multiply
   21,368.81x = 51,819.75 × 51,819.75
4. Step 4: Simplify right side
   21,368.81x = 2,685,286,490.06
5. Step 5: Solve for x
   x = 2,685,286,490.06/21,368.81
6. Step 6: Final answer
   x = 125,663.81