Finding the Fourth Proportional to 9,290.47, 12,821.10 and 5,257

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.47 : 12,821.10 = 5,257 : x
2. Step 2: Convert to fraction form
   9,290.47/12,821.10 = 5,257/x
3. Step 3: Cross multiply
   9,290.47x = 12,821.10 × 5,257
4. Step 4: Simplify right side
   9,290.47x = 67,400,522.70
5. Step 5: Solve for x
   x = 67,400,522.70/9,290.47
6. Step 6: Final answer
   x = 7,254.80