Finding the Fourth Proportional to 13,085.02, 18,057.42 and 7,116.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.02 : 18,057.42 = 7,116.88 : x
2. Step 2: Convert to fraction form
   13,085.02/18,057.42 = 7,116.88/x
3. Step 3: Cross multiply
   13,085.02x = 18,057.42 × 7,116.88
4. Step 4: Simplify right side
   13,085.02x = 128,512,491.25
5. Step 5: Solve for x
   x = 128,512,491.25/13,085.02
6. Step 6: Final answer
   x = 9,821.34