Finding the Fourth Proportional to 310,111.89, 465,083.83 and 85,418.88

Step by Step Solution

1. Step 1: Write the proportion equation
   310,111.89 : 465,083.83 = 85,418.88 : x
2. Step 2: Convert to fraction form
   310,111.89/465,083.83 = 85,418.88/x
3. Step 3: Cross multiply
   310,111.89x = 465,083.83 × 85,418.88
4. Step 4: Simplify right side
   310,111.89x = 39,726,941,899.45
5. Step 5: Solve for x
   x = 39,726,941,899.45/310,111.89
6. Step 6: Final answer
   x = 128,105.19