Finding the Fourth Proportional to 1,561.18, 2,154.86 and 971.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.18 : 2,154.86 = 971.37 : x
2. Step 2: Convert to fraction form
   1,561.18/2,154.86 = 971.37/x
3. Step 3: Cross multiply
   1,561.18x = 2,154.86 × 971.37
4. Step 4: Simplify right side
   1,561.18x = 2,093,166.36
5. Step 5: Solve for x
   x = 2,093,166.36/1,561.18
6. Step 6: Final answer
   x = 1,340.76