Finding the Fourth Proportional to 1,913.51, 2,640.52 and 1,167.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.51 : 2,640.52 = 1,167.86 : x
2. Step 2: Convert to fraction form
   1,913.51/2,640.52 = 1,167.86/x
3. Step 3: Cross multiply
   1,913.51x = 2,640.52 × 1,167.86
4. Step 4: Simplify right side
   1,913.51x = 3,083,757.69
5. Step 5: Solve for x
   x = 3,083,757.69/1,913.51
6. Step 6: Final answer
   x = 1,611.57