Finding the Fourth Proportional to 13,072.16, 18,039.53 and 7,407.99

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.16 : 18,039.53 = 7,407.99 : x
2. Step 2: Convert to fraction form
   13,072.16/18,039.53 = 7,407.99/x
3. Step 3: Cross multiply
   13,072.16x = 18,039.53 × 7,407.99
4. Step 4: Simplify right side
   13,072.16x = 133,636,549.13
5. Step 5: Solve for x
   x = 133,636,549.13/13,072.16
6. Step 6: Final answer
   x = 10,222.99