Finding the Fourth Proportional to 21,142.59, 31,711.45 and 7,102.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,142.59 : 31,711.45 = 7,102.05 : x
2. Step 2: Convert to fraction form
   21,142.59/31,711.45 = 7,102.05/x
3. Step 3: Cross multiply
   21,142.59x = 31,711.45 × 7,102.05
4. Step 4: Simplify right side
   21,142.59x = 225,216,303.47
5. Step 5: Solve for x
   x = 225,216,303.47/21,142.59
6. Step 6: Final answer
   x = 10,652.26