Finding the Fourth Proportional to 5,178.78, 7,145.55 and 4,342.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.78 : 7,145.55 = 4,342.86 : x
2. Step 2: Convert to fraction form
   5,178.78/7,145.55 = 4,342.86/x
3. Step 3: Cross multiply
   5,178.78x = 7,145.55 × 4,342.86
4. Step 4: Simplify right side
   5,178.78x = 31,032,123.27
5. Step 5: Solve for x
   x = 31,032,123.27/5,178.78
6. Step 6: Final answer
   x = 5,992.17