Finding the Fourth Proportional to 28,494.09, 42,749.78 and 13,698.81

Step by Step Solution

1. Step 1: Write the proportion equation
   28,494.09 : 42,749.78 = 13,698.81 : x
2. Step 2: Convert to fraction form
   28,494.09/42,749.78 = 13,698.81/x
3. Step 3: Cross multiply
   28,494.09x = 42,749.78 × 13,698.81
4. Step 4: Simplify right side
   28,494.09x = 585,621,045.27
5. Step 5: Solve for x
   x = 585,621,045.27/28,494.09
6. Step 6: Final answer
   x = 20,552.37