Finding the Fourth Proportional to 1,561.37, 2,154.71 and 862.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.37 : 2,154.71 = 862.74 : x
2. Step 2: Convert to fraction form
   1,561.37/2,154.71 = 862.74/x
3. Step 3: Cross multiply
   1,561.37x = 2,154.71 × 862.74
4. Step 4: Simplify right side
   1,561.37x = 1,858,954.51
5. Step 5: Solve for x
   x = 1,858,954.51/1,561.37
6. Step 6: Final answer
   x = 1,190.59