Finding the Fourth Proportional to 85,411.12, 128,103.54 and 28,486.02

Step by Step Solution

1. Step 1: Write the proportion equation
   85,411.12 : 128,103.54 = 28,486.02 : x
2. Step 2: Convert to fraction form
   85,411.12/128,103.54 = 28,486.02/x
3. Step 3: Cross multiply
   85,411.12x = 128,103.54 × 28,486.02
4. Step 4: Simplify right side
   85,411.12x = 3,649,160,002.51
5. Step 5: Solve for x
   x = 3,649,160,002.51/85,411.12
6. Step 6: Final answer
   x = 42,724.65