Finding the Fourth Proportional to 21,140.84, 31,708.82 and 7,100.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,140.84 : 31,708.82 = 7,100.30 : x
2. Step 2: Convert to fraction form
   21,140.84/31,708.82 = 7,100.30/x
3. Step 3: Cross multiply
   21,140.84x = 31,708.82 × 7,100.30
4. Step 4: Simplify right side
   21,140.84x = 225,141,940.60
5. Step 5: Solve for x
   x = 225,141,940.60/21,140.84
6. Step 6: Final answer
   x = 10,649.62