Finding the Fourth Proportional to 81,081.29, 121,696.68 and 41,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   81,081.29 : 121,696.68 = 41,128.31 : x
2. Step 2: Convert to fraction form
   81,081.29/121,696.68 = 41,128.31/x
3. Step 3: Cross multiply
   81,081.29x = 121,696.68 × 41,128.31
4. Step 4: Simplify right side
   81,081.29x = 5,005,178,781.01
5. Step 5: Solve for x
   x = 5,005,178,781.01/81,081.29
6. Step 6: Final answer
   x = 61,730.38