Finding the Fourth Proportional to 13,071.72, 18,038.61 and 7,103.19

Step by Step Solution

1. Step 1: Write the proportion equation
   13,071.72 : 18,038.61 = 7,103.19 : x
2. Step 2: Convert to fraction form
   13,071.72/18,038.61 = 7,103.19/x
3. Step 3: Cross multiply
   13,071.72x = 18,038.61 × 7,103.19
4. Step 4: Simplify right side
   13,071.72x = 128,131,674.17
5. Step 5: Solve for x
   x = 128,131,674.17/13,071.72
6. Step 6: Final answer
   x = 9,802.20