Finding the Fourth Proportional to 1,434.72, 2,153.25 and 613.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.72 : 2,153.25 = 613.56 : x
2. Step 2: Convert to fraction form
   1,434.72/2,153.25 = 613.56/x
3. Step 3: Cross multiply
   1,434.72x = 2,153.25 × 613.56
4. Step 4: Simplify right side
   1,434.72x = 1,321,148.07
5. Step 5: Solve for x
   x = 1,321,148.07/1,434.72
6. Step 6: Final answer
   x = 920.84