Finding the Fourth Proportional to 28,153.68, 42,191.04 and 21,885

Step by Step Solution

1. Step 1: Write the proportion equation
   28,153.68 : 42,191.04 = 21,885 : x
2. Step 2: Convert to fraction form
   28,153.68/42,191.04 = 21,885/x
3. Step 3: Cross multiply
   28,153.68x = 42,191.04 × 21,885
4. Step 4: Simplify right side
   28,153.68x = 923,350,910.40
5. Step 5: Solve for x
   x = 923,350,910.40/28,153.68
6. Step 6: Final answer
   x = 32,796.81