Finding the Fourth Proportional to 13,870.81, 20,796.50 and 5,104.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.81 : 20,796.50 = 5,104.59 : x
2. Step 2: Convert to fraction form
   13,870.81/20,796.50 = 5,104.59/x
3. Step 3: Cross multiply
   13,870.81x = 20,796.50 × 5,104.59
4. Step 4: Simplify right side
   13,870.81x = 106,157,476.43
5. Step 5: Solve for x
   x = 106,157,476.43/13,870.81
6. Step 6: Final answer
   x = 7,653.30