Finding the Fourth Proportional to 20,483.31, 28,275.69 and 13,772.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,483.31 : 28,275.69 = 13,772.82 : x
2. Step 2: Convert to fraction form
   20,483.31/28,275.69 = 13,772.82/x
3. Step 3: Cross multiply
   20,483.31x = 28,275.69 × 13,772.82
4. Step 4: Simplify right side
   20,483.31x = 389,435,988.75
5. Step 5: Solve for x
   x = 389,435,988.75/20,483.31
6. Step 6: Final answer
   x = 19,012.36