Finding the Fourth Proportional to 13,858.50, 20,790.49 and 7,087.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,858.50 : 20,790.49 = 7,087.01 : x
2. Step 2: Convert to fraction form
   13,858.50/20,790.49 = 7,087.01/x
3. Step 3: Cross multiply
   13,858.50x = 20,790.49 × 7,087.01
4. Step 4: Simplify right side
   13,858.50x = 147,342,288.86
5. Step 5: Solve for x
   x = 147,342,288.86/13,858.50
6. Step 6: Final answer
   x = 10,631.91