Finding the Fourth Proportional to 20,756.08, 31,131.82 and 7,428.54

Step by Step Solution

1. Step 1: Write the proportion equation
   20,756.08 : 31,131.82 = 7,428.54 : x
2. Step 2: Convert to fraction form
   20,756.08/31,131.82 = 7,428.54/x
3. Step 3: Cross multiply
   20,756.08x = 31,131.82 × 7,428.54
4. Step 4: Simplify right side
   20,756.08x = 231,263,970.14
5. Step 5: Solve for x
   x = 231,263,970.14/20,756.08
6. Step 6: Final answer
   x = 11,141.99