Finding the Fourth Proportional to 1,561.08, 2,154.36 and 971.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.08 : 2,154.36 = 971.52 : x
2. Step 2: Convert to fraction form
   1,561.08/2,154.36 = 971.52/x
3. Step 3: Cross multiply
   1,561.08x = 2,154.36 × 971.52
4. Step 4: Simplify right side
   1,561.08x = 2,093,003.83
5. Step 5: Solve for x
   x = 2,093,003.83/1,561.08
6. Step 6: Final answer
   x = 1,340.74