Finding the Fourth Proportional to 21,032.21, 31,532.61 and 12,710.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,032.21 : 31,532.61 = 12,710.33 : x
2. Step 2: Convert to fraction form
   21,032.21/31,532.61 = 12,710.33/x
3. Step 3: Cross multiply
   21,032.21x = 31,532.61 × 12,710.33
4. Step 4: Simplify right side
   21,032.21x = 400,789,878.86
5. Step 5: Solve for x
   x = 400,789,878.86/21,032.21
6. Step 6: Final answer
   x = 19,056.01