Finding the Fourth Proportional to 13,071.49, 18,038.72 and 7,103.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,071.49 : 18,038.72 = 7,103.21 : x
2. Step 2: Convert to fraction form
   13,071.49/18,038.72 = 7,103.21/x
3. Step 3: Cross multiply
   13,071.49x = 18,038.72 × 7,103.21
4. Step 4: Simplify right side
   13,071.49x = 128,132,743.86
5. Step 5: Solve for x
   x = 128,132,743.86/13,071.49
6. Step 6: Final answer
   x = 9,802.46