Finding the Fourth Proportional to 28,153.89, 42,243.14 and 21,904.54

Step by Step Solution

1. Step 1: Write the proportion equation
   28,153.89 : 42,243.14 = 21,904.54 : x
2. Step 2: Convert to fraction form
   28,153.89/42,243.14 = 21,904.54/x
3. Step 3: Cross multiply
   28,153.89x = 42,243.14 × 21,904.54
4. Step 4: Simplify right side
   28,153.89x = 925,316,499.01
5. Step 5: Solve for x
   x = 925,316,499.01/28,153.89
6. Step 6: Final answer
   x = 32,866.38