Finding the Fourth Proportional to 61,091.28, 91,647.72 and 21,671.28

Step by Step Solution

1. Step 1: Write the proportion equation
   61,091.28 : 91,647.72 = 21,671.28 : x
2. Step 2: Convert to fraction form
   61,091.28/91,647.72 = 21,671.28/x
3. Step 3: Cross multiply
   61,091.28x = 91,647.72 × 21,671.28
4. Step 4: Simplify right side
   61,091.28x = 1,986,123,401.48
5. Step 5: Solve for x
   x = 1,986,123,401.48/61,091.28
6. Step 6: Final answer
   x = 32,510.75