Finding the Fourth Proportional to 21,055.90, 31,574.83 and 7,012.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,055.90 : 31,574.83 = 7,012.12 : x
2. Step 2: Convert to fraction form
   21,055.90/31,574.83 = 7,012.12/x
3. Step 3: Cross multiply
   21,055.90x = 31,574.83 × 7,012.12
4. Step 4: Simplify right side
   21,055.90x = 221,406,304.00
5. Step 5: Solve for x
   x = 221,406,304.00/21,055.90
6. Step 6: Final answer
   x = 10,515.17