Finding the Fourth Proportional to 5,085.28, 7,628.42 and 2,123.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,085.28 : 7,628.42 = 2,123.12 : x
2. Step 2: Convert to fraction form
   5,085.28/7,628.42 = 2,123.12/x
3. Step 3: Cross multiply
   5,085.28x = 7,628.42 × 2,123.12
4. Step 4: Simplify right side
   5,085.28x = 16,196,051.07
5. Step 5: Solve for x
   x = 16,196,051.07/5,085.28
6. Step 6: Final answer
   x = 3,184.89