Finding the Fourth Proportional to 1,561.61, 2,154.35 and 940.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.61 : 2,154.35 = 940.25 : x
2. Step 2: Convert to fraction form
   1,561.61/2,154.35 = 940.25/x
3. Step 3: Cross multiply
   1,561.61x = 2,154.35 × 940.25
4. Step 4: Simplify right side
   1,561.61x = 2,025,622.89
5. Step 5: Solve for x
   x = 2,025,622.89/1,561.61
6. Step 6: Final answer
   x = 1,297.14