Finding the Fourth Proportional to 81,205.98, 121,810.32 and 28,616.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,205.98 : 121,810.32 = 28,616.10 : x
2. Step 2: Convert to fraction form
   81,205.98/121,810.32 = 28,616.10/x
3. Step 3: Cross multiply
   81,205.98x = 121,810.32 × 28,616.10
4. Step 4: Simplify right side
   81,205.98x = 3,485,736,298.15
5. Step 5: Solve for x
   x = 3,485,736,298.15/81,205.98
6. Step 6: Final answer
   x = 42,924.63