Finding the Fourth Proportional to 12,928.86, 17,841.21 and 7,551.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928.86 : 17,841.21 = 7,551.57 : x
2. Step 2: Convert to fraction form
   12,928.86/17,841.21 = 7,551.57/x
3. Step 3: Cross multiply
   12,928.86x = 17,841.21 × 7,551.57
4. Step 4: Simplify right side
   12,928.86x = 134,729,146.20
5. Step 5: Solve for x
   x = 134,729,146.20/12,928.86
6. Step 6: Final answer
   x = 10,420.81