Finding the Fourth Proportional to 1,561.46, 2,153.30 and 971.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.46 : 2,153.30 = 971.58 : x
2. Step 2: Convert to fraction form
   1,561.46/2,153.30 = 971.58/x
3. Step 3: Cross multiply
   1,561.46x = 2,153.30 × 971.58
4. Step 4: Simplify right side
   1,561.46x = 2,092,103.21
5. Step 5: Solve for x
   x = 2,092,103.21/1,561.46
6. Step 6: Final answer
   x = 1,339.84