Finding the Fourth Proportional to 21,009.69, 31,506.12 and 10,476.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,009.69 : 31,506.12 = 10,476.18 : x
2. Step 2: Convert to fraction form
   21,009.69/31,506.12 = 10,476.18/x
3. Step 3: Cross multiply
   21,009.69x = 31,506.12 × 10,476.18
4. Step 4: Simplify right side
   21,009.69x = 330,063,784.22
5. Step 5: Solve for x
   x = 330,063,784.22/21,009.69
6. Step 6: Final answer
   x = 15,710.07