Finding the Fourth Proportional to 38,786.10, 53,524.71 and 21,790.83

Step by Step Solution

1. Step 1: Write the proportion equation
   38,786.10 : 53,524.71 = 21,790.83 : x
2. Step 2: Convert to fraction form
   38,786.10/53,524.71 = 21,790.83/x
3. Step 3: Cross multiply
   38,786.10x = 53,524.71 × 21,790.83
4. Step 4: Simplify right side
   38,786.10x = 1,166,347,856.41
5. Step 5: Solve for x
   x = 1,166,347,856.41/38,786.10
6. Step 6: Final answer
   x = 30,071.28