Finding the Fourth Proportional to 28,089.84, 42,139.32 and 10,561.08

Step by Step Solution

1. Step 1: Write the proportion equation
   28,089.84 : 42,139.32 = 10,561.08 : x
2. Step 2: Convert to fraction form
   28,089.84/42,139.32 = 10,561.08/x
3. Step 3: Cross multiply
   28,089.84x = 42,139.32 × 10,561.08
4. Step 4: Simplify right side
   28,089.84x = 445,036,729.67
5. Step 5: Solve for x
   x = 445,036,729.67/28,089.84
6. Step 6: Final answer
   x = 15,843.33