Finding the Fourth Proportional to 1,560.72, 2,153.64 and 1,008.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.72 : 2,153.64 = 1,008.72 : x
2. Step 2: Convert to fraction form
   1,560.72/2,153.64 = 1,008.72/x
3. Step 3: Cross multiply
   1,560.72x = 2,153.64 × 1,008.72
4. Step 4: Simplify right side
   1,560.72x = 2,172,419.74
5. Step 5: Solve for x
   x = 2,172,419.74/1,560.72
6. Step 6: Final answer
   x = 1,391.93