Finding the Fourth Proportional to 21,056.50, 31,574.17 and 7,011.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,056.50 : 31,574.17 = 7,011.57 : x
2. Step 2: Convert to fraction form
   21,056.50/31,574.17 = 7,011.57/x
3. Step 3: Cross multiply
   21,056.50x = 31,574.17 × 7,011.57
4. Step 4: Simplify right side
   21,056.50x = 221,384,503.15
5. Step 5: Solve for x
   x = 221,384,503.15/21,056.50
6. Step 6: Final answer
   x = 10,513.83