Finding the Fourth Proportional to 8,572.47, 12,855.50 and 2,948.55

Step by Step Solution

1. Step 1: Write the proportion equation
   8,572.47 : 12,855.50 = 2,948.55 : x
2. Step 2: Convert to fraction form
   8,572.47/12,855.50 = 2,948.55/x
3. Step 3: Cross multiply
   8,572.47x = 12,855.50 × 2,948.55
4. Step 4: Simplify right side
   8,572.47x = 37,905,069.78
5. Step 5: Solve for x
   x = 37,905,069.78/8,572.47
6. Step 6: Final answer
   x = 4,421.72