Finding the Fourth Proportional to 8,211.70, 12,292.71 and 5,292.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,211.70 : 12,292.71 = 5,292.10 : x
2. Step 2: Convert to fraction form
   8,211.70/12,292.71 = 5,292.10/x
3. Step 3: Cross multiply
   8,211.70x = 12,292.71 × 5,292.10
4. Step 4: Simplify right side
   8,211.70x = 65,054,250.59
5. Step 5: Solve for x
   x = 65,054,250.59/8,211.70
6. Step 6: Final answer
   x = 7,922.14