Finding the Fourth Proportional to 20,897.33, 28,809.83 and 14,918.60

Step by Step Solution

1. Step 1: Write the proportion equation
   20,897.33 : 28,809.83 = 14,918.60 : x
2. Step 2: Convert to fraction form
   20,897.33/28,809.83 = 14,918.60/x
3. Step 3: Cross multiply
   20,897.33x = 28,809.83 × 14,918.60
4. Step 4: Simplify right side
   20,897.33x = 429,802,439.16
5. Step 5: Solve for x
   x = 429,802,439.16/20,897.33
6. Step 6: Final answer
   x = 20,567.34