Finding the Fourth Proportional to 12,391.42, 18,588.15 and 3,506.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.42 : 18,588.15 = 3,506.77 : x
2. Step 2: Convert to fraction form
   12,391.42/18,588.15 = 3,506.77/x
3. Step 3: Cross multiply
   12,391.42x = 18,588.15 × 3,506.77
4. Step 4: Simplify right side
   12,391.42x = 65,184,320.31
5. Step 5: Solve for x
   x = 65,184,320.31/12,391.42
6. Step 6: Final answer
   x = 5,260.44