Finding the Fourth Proportional to 13,870.38, 19,146.42 and 9,417.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.38 : 19,146.42 = 9,417.18 : x
2. Step 2: Convert to fraction form
   13,870.38/19,146.42 = 9,417.18/x
3. Step 3: Cross multiply
   13,870.38x = 19,146.42 × 9,417.18
4. Step 4: Simplify right side
   13,870.38x = 180,305,283.50
5. Step 5: Solve for x
   x = 180,305,283.50/13,870.38
6. Step 6: Final answer
   x = 12,999.30