Finding the Fourth Proportional to 7,059.78, 10,580.52 and 5,290.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,059.78 : 10,580.52 = 5,290.89 : x
2. Step 2: Convert to fraction form
   7,059.78/10,580.52 = 5,290.89/x
3. Step 3: Cross multiply
   7,059.78x = 10,580.52 × 5,290.89
4. Step 4: Simplify right side
   7,059.78x = 55,980,367.46
5. Step 5: Solve for x
   x = 55,980,367.46/7,059.78
6. Step 6: Final answer
   x = 7,929.48