Finding the Fourth Proportional to 13,072.56, 18,039.88 and 7,104.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.56 : 18,039.88 = 7,104.12 : x
2. Step 2: Convert to fraction form
   13,072.56/18,039.88 = 7,104.12/x
3. Step 3: Cross multiply
   13,072.56x = 18,039.88 × 7,104.12
4. Step 4: Simplify right side
   13,072.56x = 128,157,472.31
5. Step 5: Solve for x
   x = 128,157,472.31/13,072.56
6. Step 6: Final answer
   x = 9,803.55