Finding the Fourth Proportional to 13,885.98, 19,142.72 and 9,900.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,885.98 : 19,142.72 = 9,900.18 : x
2. Step 2: Convert to fraction form
   13,885.98/19,142.72 = 9,900.18/x
3. Step 3: Cross multiply
   13,885.98x = 19,142.72 × 9,900.18
4. Step 4: Simplify right side
   13,885.98x = 189,516,373.69
5. Step 5: Solve for x
   x = 189,516,373.69/13,885.98
6. Step 6: Final answer
   x = 13,648.04