Finding the Fourth Proportional to 20,970.50, 28,934.52 and 15,308.33

Step by Step Solution

1. Step 1: Write the proportion equation
   20,970.50 : 28,934.52 = 15,308.33 : x
2. Step 2: Convert to fraction form
   20,970.50/28,934.52 = 15,308.33/x
3. Step 3: Cross multiply
   20,970.50x = 28,934.52 × 15,308.33
4. Step 4: Simplify right side
   20,970.50x = 442,938,978.47
5. Step 5: Solve for x
   x = 442,938,978.47/20,970.50
6. Step 6: Final answer
   x = 21,122.01