Finding the Fourth Proportional to 1,931.86, 2,667.36 and 1,186.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.86 : 2,667.36 = 1,186.82 : x
2. Step 2: Convert to fraction form
   1,931.86/2,667.36 = 1,186.82/x
3. Step 3: Cross multiply
   1,931.86x = 2,667.36 × 1,186.82
4. Step 4: Simplify right side
   1,931.86x = 3,165,676.20
5. Step 5: Solve for x
   x = 3,165,676.20/1,931.86
6. Step 6: Final answer
   x = 1,638.67