Finding the Fourth Proportional to 28,410.72, 39,185.82 and 20,854.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,410.72 : 39,185.82 = 20,854.50 : x
2. Step 2: Convert to fraction form
   28,410.72/39,185.82 = 20,854.50/x
3. Step 3: Cross multiply
   28,410.72x = 39,185.82 × 20,854.50
4. Step 4: Simplify right side
   28,410.72x = 817,200,683.19
5. Step 5: Solve for x
   x = 817,200,683.19/28,410.72
6. Step 6: Final answer
   x = 28,763.81