Finding the Fourth Proportional to 28,131.75, 42,175.35 and 13,337.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,131.75 : 42,175.35 = 13,337.10 : x
2. Step 2: Convert to fraction form
   28,131.75/42,175.35 = 13,337.10/x
3. Step 3: Cross multiply
   28,131.75x = 42,175.35 × 13,337.10
4. Step 4: Simplify right side
   28,131.75x = 562,496,860.49
5. Step 5: Solve for x
   x = 562,496,860.49/28,131.75
6. Step 6: Final answer
   x = 19,995.09