Finding the Fourth Proportional to 85,919.38, 128,801.30 and 30,502.42

Step by Step Solution

1. Step 1: Write the proportion equation
   85,919.38 : 128,801.30 = 30,502.42 : x
2. Step 2: Convert to fraction form
   85,919.38/128,801.30 = 30,502.42/x
3. Step 3: Cross multiply
   85,919.38x = 128,801.30 × 30,502.42
4. Step 4: Simplify right side
   85,919.38x = 3,928,751,349.15
5. Step 5: Solve for x
   x = 3,928,751,349.15/85,919.38
6. Step 6: Final answer
   x = 45,726.02