Finding the Fourth Proportional to 28,111.20, 42,134.34 and 10,569.84

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.20 : 42,134.34 = 10,569.84 : x
2. Step 2: Convert to fraction form
   28,111.20/42,134.34 = 10,569.84/x
3. Step 3: Cross multiply
   28,111.20x = 42,134.34 × 10,569.84
4. Step 4: Simplify right side
   28,111.20x = 445,353,232.31
5. Step 5: Solve for x
   x = 445,353,232.31/28,111.20
6. Step 6: Final answer
   x = 15,842.56