Finding the Fourth Proportional to 20,815.59, 31,223.31 and 7,488.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,815.59 : 31,223.31 = 7,488.56 : x
2. Step 2: Convert to fraction form
   20,815.59/31,223.31 = 7,488.56/x
3. Step 3: Cross multiply
   20,815.59x = 31,223.31 × 7,488.56
4. Step 4: Simplify right side
   20,815.59x = 233,817,474.22
5. Step 5: Solve for x
   x = 233,817,474.22/20,815.59
6. Step 6: Final answer
   x = 11,232.81