Finding the Fourth Proportional to 3,420.43, 5,131.29 and 1,081.03

Step by Step Solution

1. Step 1: Write the proportion equation
   3,420.43 : 5,131.29 = 1,081.03 : x
2. Step 2: Convert to fraction form
   3,420.43/5,131.29 = 1,081.03/x
3. Step 3: Cross multiply
   3,420.43x = 5,131.29 × 1,081.03
4. Step 4: Simplify right side
   3,420.43x = 5,547,065.98
5. Step 5: Solve for x
   x = 5,547,065.98/3,420.43
6. Step 6: Final answer
   x = 1,621.74