Finding the Fourth Proportional to 57,379.78, 79,161.87 and 42,308.20

Step by Step Solution

1. Step 1: Write the proportion equation
   57,379.78 : 79,161.87 = 42,308.20 : x
2. Step 2: Convert to fraction form
   57,379.78/79,161.87 = 42,308.20/x
3. Step 3: Cross multiply
   57,379.78x = 79,161.87 × 42,308.20
4. Step 4: Simplify right side
   57,379.78x = 3,349,196,228.33
5. Step 5: Solve for x
   x = 3,349,196,228.33/57,379.78
6. Step 6: Final answer
   x = 58,368.93