Finding the Fourth Proportional to 21,185.80, 31,756.52 and 7,140.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,185.80 : 31,756.52 = 7,140.96 : x
2. Step 2: Convert to fraction form
   21,185.80/31,756.52 = 7,140.96/x
3. Step 3: Cross multiply
   21,185.80x = 31,756.52 × 7,140.96
4. Step 4: Simplify right side
   21,185.80x = 226,772,039.06
5. Step 5: Solve for x
   x = 226,772,039.06/21,185.80
6. Step 6: Final answer
   x = 10,703.96