Finding the Fourth Proportional to 28,002.58, 42,005.91 and 11,142.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28,002.58 : 42,005.91 = 11,142.18 : x
2. Step 2: Convert to fraction form
   28,002.58/42,005.91 = 11,142.18/x
3. Step 3: Cross multiply
   28,002.58x = 42,005.91 × 11,142.18
4. Step 4: Simplify right side
   28,002.58x = 468,037,410.28
5. Step 5: Solve for x
   x = 468,037,410.28/28,002.58
6. Step 6: Final answer
   x = 16,714.08