Finding the Fourth Proportional to 85,978.89, 128,891.39 and 33,375.87

Step by Step Solution

1. Step 1: Write the proportion equation
   85,978.89 : 128,891.39 = 33,375.87 : x
2. Step 2: Convert to fraction form
   85,978.89/128,891.39 = 33,375.87/x
3. Step 3: Cross multiply
   85,978.89x = 128,891.39 × 33,375.87
4. Step 4: Simplify right side
   85,978.89x = 4,301,862,109.88
5. Step 5: Solve for x
   x = 4,301,862,109.88/85,978.89
6. Step 6: Final answer
   x = 50,033.93