Finding the Fourth Proportional to 21,171.74, 31,746.24 and 7,127.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,171.74 : 31,746.24 = 7,127.10 : x
2. Step 2: Convert to fraction form
   21,171.74/31,746.24 = 7,127.10/x
3. Step 3: Cross multiply
   21,171.74x = 31,746.24 × 7,127.10
4. Step 4: Simplify right side
   21,171.74x = 226,258,627.10
5. Step 5: Solve for x
   x = 226,258,627.10/21,171.74
6. Step 6: Final answer
   x = 10,686.83