Finding the Fourth Proportional to 13,085.46, 18,057.54 and 7,420.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.46 : 18,057.54 = 7,420.72 : x
2. Step 2: Convert to fraction form
   13,085.46/18,057.54 = 7,420.72/x
3. Step 3: Cross multiply
   13,085.46x = 18,057.54 × 7,420.72
4. Step 4: Simplify right side
   13,085.46x = 133,999,948.23
5. Step 5: Solve for x
   x = 133,999,948.23/13,085.46
6. Step 6: Final answer
   x = 10,240.37