Finding the Fourth Proportional to 1,561.48, 2,154.90 and 862.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.48 : 2,154.90 = 862.84 : x
2. Step 2: Convert to fraction form
   1,561.48/2,154.90 = 862.84/x
3. Step 3: Cross multiply
   1,561.48x = 2,154.90 × 862.84
4. Step 4: Simplify right side
   1,561.48x = 1,859,333.92
5. Step 5: Solve for x
   x = 1,859,333.92/1,561.48
6. Step 6: Final answer
   x = 1,190.75