Finding the Fourth Proportional to 13,128.48, 18,116.73 and 7,160.00

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128.48 : 18,116.73 = 7,160.00 : x
2. Step 2: Convert to fraction form
   13,128.48/18,116.73 = 7,160.00/x
3. Step 3: Cross multiply
   13,128.48x = 18,116.73 × 7,160.00
4. Step 4: Simplify right side
   13,128.48x = 129,715,696.22
5. Step 5: Solve for x
   x = 129,715,696.22/13,128.48
6. Step 6: Final answer
   x = 9,880.48