Finding the Fourth Proportional to 28,131.21, 42,206.52 and 10,606.05

Step by Step Solution

1. Step 1: Write the proportion equation
   28,131.21 : 42,206.52 = 10,606.05 : x
2. Step 2: Convert to fraction form
   28,131.21/42,206.52 = 10,606.05/x
3. Step 3: Cross multiply
   28,131.21x = 42,206.52 × 10,606.05
4. Step 4: Simplify right side
   28,131.21x = 447,644,461.45
5. Step 5: Solve for x
   x = 447,644,461.45/28,131.21
6. Step 6: Final answer
   x = 15,912.73