Finding the Fourth Proportional to 1,561.96, 2,153.76 and 1,064.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.96 : 2,153.76 = 1,064.89 : x
2. Step 2: Convert to fraction form
   1,561.96/2,153.76 = 1,064.89/x
3. Step 3: Cross multiply
   1,561.96x = 2,153.76 × 1,064.89
4. Step 4: Simplify right side
   1,561.96x = 2,293,517.49
5. Step 5: Solve for x
   x = 2,293,517.49/1,561.96
6. Step 6: Final answer
   x = 1,468.36