Finding the Third Proportional to 21,128.34 and 28,458.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,128.34 : 28,458.84 = 28,458.84 : x
2. Step 2: Convert to fraction form
   21,128.34/28,458.84 = 28,458.84/x
3. Step 3: Cross multiply
   21,128.34x = 28,458.84 × 28,458.84
4. Step 4: Simplify right side
   21,128.34x = 809,905,787.59
5. Step 5: Solve for x
   x = 809,905,787.59/21,128.34
6. Step 6: Final answer
   x = 38,332.67