Finding the Fourth Proportional to 2,112.31, 3,168.49 and 651.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.31 : 3,168.49 = 651.45 : x
2. Step 2: Convert to fraction form
   2,112.31/3,168.49 = 651.45/x
3. Step 3: Cross multiply
   2,112.31x = 3,168.49 × 651.45
4. Step 4: Simplify right side
   2,112.31x = 2,064,122.36
5. Step 5: Solve for x
   x = 2,064,122.36/2,112.31
6. Step 6: Final answer
   x = 977.19