Finding the Fourth Proportional to 1,561.78, 2,343.06 and 1,284.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.78 : 2,343.06 = 1,284.59 : x
2. Step 2: Convert to fraction form
   1,561.78/2,343.06 = 1,284.59/x
3. Step 3: Cross multiply
   1,561.78x = 2,343.06 × 1,284.59
4. Step 4: Simplify right side
   1,561.78x = 3,009,871.45
5. Step 5: Solve for x
   x = 3,009,871.45/1,561.78
6. Step 6: Final answer
   x = 1,927.21