Finding the Fourth Proportional to 4,742.69, 7,112.41 and 1,820.21

Step by Step Solution

1. Step 1: Write the proportion equation
   4,742.69 : 7,112.41 = 1,820.21 : x
2. Step 2: Convert to fraction form
   4,742.69/7,112.41 = 1,820.21/x
3. Step 3: Cross multiply
   4,742.69x = 7,112.41 × 1,820.21
4. Step 4: Simplify right side
   4,742.69x = 12,946,039.69
5. Step 5: Solve for x
   x = 12,946,039.69/4,742.69
6. Step 6: Final answer
   x = 2,729.69