Finding the Fourth Proportional to 2,111.88, 3,168.45 and 651.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.88 : 3,168.45 = 651.15 : x
2. Step 2: Convert to fraction form
   2,111.88/3,168.45 = 651.15/x
3. Step 3: Cross multiply
   2,111.88x = 3,168.45 × 651.15
4. Step 4: Simplify right side
   2,111.88x = 2,063,136.22
5. Step 5: Solve for x
   x = 2,063,136.22/2,111.88
6. Step 6: Final answer
   x = 976.92