Finding the Fourth Proportional to 61,109.28, 91,674.72 and 21,689.28

Step by Step Solution

1. Step 1: Write the proportion equation
   61,109.28 : 91,674.72 = 21,689.28 : x
2. Step 2: Convert to fraction form
   61,109.28/91,674.72 = 21,689.28/x
3. Step 3: Cross multiply
   61,109.28x = 91,674.72 × 21,689.28
4. Step 4: Simplify right side
   61,109.28x = 1,988,358,671.00
5. Step 5: Solve for x
   x = 1,988,358,671.00/61,109.28
6. Step 6: Final answer
   x = 32,537.75