Finding the Fourth Proportional to 10,080.13, 15,121.76 and 5,147.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,080.13 : 15,121.76 = 5,147.10 : x
2. Step 2: Convert to fraction form
   10,080.13/15,121.76 = 5,147.10/x
3. Step 3: Cross multiply
   10,080.13x = 15,121.76 × 5,147.10
4. Step 4: Simplify right side
   10,080.13x = 77,833,210.90
5. Step 5: Solve for x
   x = 77,833,210.90/10,080.13
6. Step 6: Final answer
   x = 7,721.45