Finding the Fourth Proportional to 38,666, 53,358.72 and 21,899

Step by Step Solution

1. Step 1: Write the proportion equation
   38,666 : 53,358.72 = 21,899 : x
2. Step 2: Convert to fraction form
   38,666/53,358.72 = 21,899/x
3. Step 3: Cross multiply
   38,666x = 53,358.72 × 21,899
4. Step 4: Simplify right side
   38,666x = 1,168,502,609.28
5. Step 5: Solve for x
   x = 1,168,502,609.28/38,666
6. Step 6: Final answer
   x = 30,220.42