Finding the Fourth Proportional to 89,128.97, 133,692.17 and 21,661.51

Step by Step Solution

1. Step 1: Write the proportion equation
   89,128.97 : 133,692.17 = 21,661.51 : x
2. Step 2: Convert to fraction form
   89,128.97/133,692.17 = 21,661.51/x
3. Step 3: Cross multiply
   89,128.97x = 133,692.17 × 21,661.51
4. Step 4: Simplify right side
   89,128.97x = 2,895,973,997.30
5. Step 5: Solve for x
   x = 2,895,973,997.30/89,128.97
6. Step 6: Final answer
   x = 32,491.95