Finding the Fourth Proportional to 28,190.42, 42,290.49 and 9,472.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,190.42 : 42,290.49 = 9,472.25 : x
2. Step 2: Convert to fraction form
   28,190.42/42,290.49 = 9,472.25/x
3. Step 3: Cross multiply
   28,190.42x = 42,290.49 × 9,472.25
4. Step 4: Simplify right side
   28,190.42x = 400,586,093.90
5. Step 5: Solve for x
   x = 400,586,093.90/28,190.42
6. Step 6: Final answer
   x = 14,210.01