Finding the Fourth Proportional to 21,034.21, 31,535.61 and 12,712.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,034.21 : 31,535.61 = 12,712.33 : x
2. Step 2: Convert to fraction form
   21,034.21/31,535.61 = 12,712.33/x
3. Step 3: Cross multiply
   21,034.21x = 31,535.61 × 12,712.33
4. Step 4: Simplify right side
   21,034.21x = 400,891,081.07
5. Step 5: Solve for x
   x = 400,891,081.07/21,034.21
6. Step 6: Final answer
   x = 19,059.00