Finding the Fourth Proportional to 3,415.78, 5,123.72 and 1,075.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,415.78 : 5,123.72 = 1,075.74 : x
2. Step 2: Convert to fraction form
   3,415.78/5,123.72 = 1,075.74/x
3. Step 3: Cross multiply
   3,415.78x = 5,123.72 × 1,075.74
4. Step 4: Simplify right side
   3,415.78x = 5,511,790.55
5. Step 5: Solve for x
   x = 5,511,790.55/3,415.78
6. Step 6: Final answer
   x = 1,613.63