Finding the Fourth Proportional to 10,070.47, 15,090.17 and 5,391.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,070.47 : 15,090.17 = 5,391.10 : x
2. Step 2: Convert to fraction form
   10,070.47/15,090.17 = 5,391.10/x
3. Step 3: Cross multiply
   10,070.47x = 15,090.17 × 5,391.10
4. Step 4: Simplify right side
   10,070.47x = 81,352,553.51
5. Step 5: Solve for x
   x = 81,352,553.51/10,070.47
6. Step 6: Final answer
   x = 8,078.33