Finding the Fourth Proportional to 12,477.76, 17,217.67 and 7,442.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,477.76 : 17,217.67 = 7,442.57 : x
2. Step 2: Convert to fraction form
   12,477.76/17,217.67 = 7,442.57/x
3. Step 3: Cross multiply
   12,477.76x = 17,217.67 × 7,442.57
4. Step 4: Simplify right side
   12,477.76x = 128,143,714.21
5. Step 5: Solve for x
   x = 128,143,714.21/12,477.76
6. Step 6: Final answer
   x = 10,269.77