Finding the Fourth Proportional to 13,859.57, 19,128.41 and 10,897.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,859.57 : 19,128.41 = 10,897.89 : x
2. Step 2: Convert to fraction form
   13,859.57/19,128.41 = 10,897.89/x
3. Step 3: Cross multiply
   13,859.57x = 19,128.41 × 10,897.89
4. Step 4: Simplify right side
   13,859.57x = 208,459,253.57
5. Step 5: Solve for x
   x = 208,459,253.57/13,859.57
6. Step 6: Final answer
   x = 15,040.82