Finding the Fourth Proportional to 3,380.79, 5,071.15 and 1,040.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,380.79 : 5,071.15 = 1,040.79 : x
2. Step 2: Convert to fraction form
   3,380.79/5,071.15 = 1,040.79/x
3. Step 3: Cross multiply
   3,380.79x = 5,071.15 × 1,040.79
4. Step 4: Simplify right side
   3,380.79x = 5,278,002.21
5. Step 5: Solve for x
   x = 5,278,002.21/3,380.79
6. Step 6: Final answer
   x = 1,561.17