Finding the Fourth Proportional to 38,899, 53,677.42 and 21,897.81

Step by Step Solution

1. Step 1: Write the proportion equation
   38,899 : 53,677.42 = 21,897.81 : x
2. Step 2: Convert to fraction form
   38,899/53,677.42 = 21,897.81/x
3. Step 3: Cross multiply
   38,899x = 53,677.42 × 21,897.81
4. Step 4: Simplify right side
   38,899x = 1,175,417,944.45
5. Step 5: Solve for x
   x = 1,175,417,944.45/38,899
6. Step 6: Final answer
   x = 30,217.18