Finding the Third Proportional to 9,639.28 and 21,123.84

Step by Step Solution

1. Step 1: Write the proportion equation
   9,639.28 : 21,123.84 = 21,123.84 : x
2. Step 2: Convert to fraction form
   9,639.28/21,123.84 = 21,123.84/x
3. Step 3: Cross multiply
   9,639.28x = 21,123.84 × 21,123.84
4. Step 4: Simplify right side
   9,639.28x = 446,216,774.77
5. Step 5: Solve for x
   x = 446,216,774.77/9,639.28
6. Step 6: Final answer
   x = 46,291.50