Finding the Fourth Proportional to 28,271.10, 42,390 and 10,742.16

Step by Step Solution

1. Step 1: Write the proportion equation
   28,271.10 : 42,390 = 10,742.16 : x
2. Step 2: Convert to fraction form
   28,271.10/42,390 = 10,742.16/x
3. Step 3: Cross multiply
   28,271.10x = 42,390 × 10,742.16
4. Step 4: Simplify right side
   28,271.10x = 455,360,162.40
5. Step 5: Solve for x
   x = 455,360,162.40/28,271.10
6. Step 6: Final answer
   x = 16,106.91