Finding the Fourth Proportional to 254,019.72, 380,791.15 and 85,422.12

Step by Step Solution

1. Step 1: Write the proportion equation
   254,019.72 : 380,791.15 = 85,422.12 : x
2. Step 2: Convert to fraction form
   254,019.72/380,791.15 = 85,422.12/x
3. Step 3: Cross multiply
   254,019.72x = 380,791.15 × 85,422.12
4. Step 4: Simplify right side
   254,019.72x = 32,527,987,310.24
5. Step 5: Solve for x
   x = 32,527,987,310.24/254,019.72
6. Step 6: Final answer
   x = 128,053.00