Finding the Fourth Proportional to 5,678.78, 8,516.34 and 4,949.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,678.78 : 8,516.34 = 4,949.78 : x
2. Step 2: Convert to fraction form
   5,678.78/8,516.34 = 4,949.78/x
3. Step 3: Cross multiply
   5,678.78x = 8,516.34 × 4,949.78
4. Step 4: Simplify right side
   5,678.78x = 42,153,966.82
5. Step 5: Solve for x
   x = 42,153,966.82/5,678.78
6. Step 6: Final answer
   x = 7,423.07