Finding the Fourth Proportional to 3,408.42, 5,113.35 and 1,187.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,408.42 : 5,113.35 = 1,187.31 : x
2. Step 2: Convert to fraction form
   3,408.42/5,113.35 = 1,187.31/x
3. Step 3: Cross multiply
   3,408.42x = 5,113.35 × 1,187.31
4. Step 4: Simplify right side
   3,408.42x = 6,071,131.59
5. Step 5: Solve for x
   x = 6,071,131.59/3,408.42
6. Step 6: Final answer
   x = 1,781.22