Finding the Fourth Proportional to 13,072.18, 18,035.63 and 7,406.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.18 : 18,035.63 = 7,406.02 : x
2. Step 2: Convert to fraction form
   13,072.18/18,035.63 = 7,406.02/x
3. Step 3: Cross multiply
   13,072.18x = 18,035.63 × 7,406.02
4. Step 4: Simplify right side
   13,072.18x = 133,572,199.46
5. Step 5: Solve for x
   x = 133,572,199.46/13,072.18
6. Step 6: Final answer
   x = 10,218.05