Finding the Fourth Proportional to 1,561.34, 2,341.83 and 407.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.34 : 2,341.83 = 407.18 : x
2. Step 2: Convert to fraction form
   1,561.34/2,341.83 = 407.18/x
3. Step 3: Cross multiply
   1,561.34x = 2,341.83 × 407.18
4. Step 4: Simplify right side
   1,561.34x = 953,546.34
5. Step 5: Solve for x
   x = 953,546.34/1,561.34
6. Step 6: Final answer
   x = 610.72