Finding the Fourth Proportional to 13,085.32, 18,057.56 and 7,117.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.32 : 18,057.56 = 7,117.04 : x
2. Step 2: Convert to fraction form
   13,085.32/18,057.56 = 7,117.04/x
3. Step 3: Cross multiply
   13,085.32x = 18,057.56 × 7,117.04
4. Step 4: Simplify right side
   13,085.32x = 128,516,376.82
5. Step 5: Solve for x
   x = 128,516,376.82/13,085.32
6. Step 6: Final answer
   x = 9,821.42