Finding the Fourth Proportional to 81,080.42, 121,676.00 and 28,489.91

Step by Step Solution

1. Step 1: Write the proportion equation
   81,080.42 : 121,676.00 = 28,489.91 : x
2. Step 2: Convert to fraction form
   81,080.42/121,676.00 = 28,489.91/x
3. Step 3: Cross multiply
   81,080.42x = 121,676.00 × 28,489.91
4. Step 4: Simplify right side
   81,080.42x = 3,466,537,538.33
5. Step 5: Solve for x
   x = 3,466,537,538.33/81,080.42
6. Step 6: Final answer
   x = 42,754.31