Finding the Fourth Proportional to 21,066.36, 31,591.80 and 7,023.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,066.36 : 31,591.80 = 7,023.72 : x
2. Step 2: Convert to fraction form
   21,066.36/31,591.80 = 7,023.72/x
3. Step 3: Cross multiply
   21,066.36x = 31,591.80 × 7,023.72
4. Step 4: Simplify right side
   21,066.36x = 221,891,957.50
5. Step 5: Solve for x
   x = 221,891,957.50/21,066.36
6. Step 6: Final answer
   x = 10,533.00