Finding the Fourth Proportional to 13,870.43, 20,807.67 and 5,104.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.43 : 20,807.67 = 5,104.61 : x
2. Step 2: Convert to fraction form
   13,870.43/20,807.67 = 5,104.61/x
3. Step 3: Cross multiply
   13,870.43x = 20,807.67 × 5,104.61
4. Step 4: Simplify right side
   13,870.43x = 106,214,936.32
5. Step 5: Solve for x
   x = 106,214,936.32/13,870.43
6. Step 6: Final answer
   x = 7,657.66