Finding the Fourth Proportional to 18,789.71, 28,188.89 and 5,642.33

Step by Step Solution

1. Step 1: Write the proportion equation
   18,789.71 : 28,188.89 = 5,642.33 : x
2. Step 2: Convert to fraction form
   18,789.71/28,188.89 = 5,642.33/x
3. Step 3: Cross multiply
   18,789.71x = 28,188.89 × 5,642.33
4. Step 4: Simplify right side
   18,789.71x = 159,050,991.50
5. Step 5: Solve for x
   x = 159,050,991.50/18,789.71
6. Step 6: Final answer
   x = 8,464.79