Finding the Fourth Proportional to 1,563.05, 2,156.82 and 864.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.05 : 2,156.82 = 864.38 : x
2. Step 2: Convert to fraction form
   1,563.05/2,156.82 = 864.38/x
3. Step 3: Cross multiply
   1,563.05x = 2,156.82 × 864.38
4. Step 4: Simplify right side
   1,563.05x = 1,864,312.07
5. Step 5: Solve for x
   x = 1,864,312.07/1,563.05
6. Step 6: Final answer
   x = 1,192.74