Finding the Fourth Proportional to 57,460.78, 79,345.74 and 42,379.59

Step by Step Solution

1. Step 1: Write the proportion equation
   57,460.78 : 79,345.74 = 42,379.59 : x
2. Step 2: Convert to fraction form
   57,460.78/79,345.74 = 42,379.59/x
3. Step 3: Cross multiply
   57,460.78x = 79,345.74 × 42,379.59
4. Step 4: Simplify right side
   57,460.78x = 3,362,639,929.45
5. Step 5: Solve for x
   x = 3,362,639,929.45/57,460.78
6. Step 6: Final answer
   x = 58,520.61