Finding the Fourth Proportional to 3,412.59, 5,111.98 and 1,561.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,412.59 : 5,111.98 = 1,561.15 : x
2. Step 2: Convert to fraction form
   3,412.59/5,111.98 = 1,561.15/x
3. Step 3: Cross multiply
   3,412.59x = 5,111.98 × 1,561.15
4. Step 4: Simplify right side
   3,412.59x = 7,980,570.06
5. Step 5: Solve for x
   x = 7,980,570.06/3,412.59
6. Step 6: Final answer
   x = 2,338.57