Finding the Fourth Proportional to 1,561.41, 2,154.70 and 862.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.41 : 2,154.70 = 862.77 : x
2. Step 2: Convert to fraction form
   1,561.41/2,154.70 = 862.77/x
3. Step 3: Cross multiply
   1,561.41x = 2,154.70 × 862.77
4. Step 4: Simplify right side
   1,561.41x = 1,859,010.52
5. Step 5: Solve for x
   x = 1,859,010.52/1,561.41
6. Step 6: Final answer
   x = 1,190.60