Finding the Fourth Proportional to 3,620.42, 5,431.31 and 1,155.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.42 : 5,431.31 = 1,155.86 : x
2. Step 2: Convert to fraction form
   3,620.42/5,431.31 = 1,155.86/x
3. Step 3: Cross multiply
   3,620.42x = 5,431.31 × 1,155.86
4. Step 4: Simplify right side
   3,620.42x = 6,277,833.98
5. Step 5: Solve for x
   x = 6,277,833.98/3,620.42
6. Step 6: Final answer
   x = 1,734.01