Finding the Fourth Proportional to 13,052.21, 19,560.83 and 7,131.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,052.21 : 19,560.83 = 7,131.78 : x
2. Step 2: Convert to fraction form
   13,052.21/19,560.83 = 7,131.78/x
3. Step 3: Cross multiply
   13,052.21x = 19,560.83 × 7,131.78
4. Step 4: Simplify right side
   13,052.21x = 139,503,500.52
5. Step 5: Solve for x
   x = 139,503,500.52/13,052.21
6. Step 6: Final answer
   x = 10,688.12