Finding the Fourth Proportional to 13,868.36, 19,139.40 and 7,900.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,868.36 : 19,139.40 = 7,900.28 : x
2. Step 2: Convert to fraction form
   13,868.36/19,139.40 = 7,900.28/x
3. Step 3: Cross multiply
   13,868.36x = 19,139.40 × 7,900.28
4. Step 4: Simplify right side
   13,868.36x = 151,206,619.03
5. Step 5: Solve for x
   x = 151,206,619.03/13,868.36
6. Step 6: Final answer
   x = 10,902.99