Finding the Fourth Proportional to 3,412.21, 5,116.49 and 1,071.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,412.21 : 5,116.49 = 1,071.78 : x
2. Step 2: Convert to fraction form
   3,412.21/5,116.49 = 1,071.78/x
3. Step 3: Cross multiply
   3,412.21x = 5,116.49 × 1,071.78
4. Step 4: Simplify right side
   3,412.21x = 5,483,767.12
5. Step 5: Solve for x
   x = 5,483,767.12/3,412.21
6. Step 6: Final answer
   x = 1,607.10