Finding the Fourth Proportional to 1,561.36, 2,154.72 and 862.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.36 : 2,154.72 = 862.76 : x
2. Step 2: Convert to fraction form
   1,561.36/2,154.72 = 862.76/x
3. Step 3: Cross multiply
   1,561.36x = 2,154.72 × 862.76
4. Step 4: Simplify right side
   1,561.36x = 1,859,006.23
5. Step 5: Solve for x
   x = 1,859,006.23/1,561.36
6. Step 6: Final answer
   x = 1,190.63