Finding the Fourth Proportional to 13,868.78, 19,139.03 and 7,900.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,868.78 : 19,139.03 = 7,900.35 : x
2. Step 2: Convert to fraction form
   13,868.78/19,139.03 = 7,900.35/x
3. Step 3: Cross multiply
   13,868.78x = 19,139.03 × 7,900.35
4. Step 4: Simplify right side
   13,868.78x = 151,204,996.16
5. Step 5: Solve for x
   x = 151,204,996.16/13,868.78
6. Step 6: Final answer
   x = 10,902.55