Finding the Fourth Proportional to 1,709.15, 2,563.89 and 613.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,709.15 : 2,563.89 = 613.94 : x
2. Step 2: Convert to fraction form
   1,709.15/2,563.89 = 613.94/x
3. Step 3: Cross multiply
   1,709.15x = 2,563.89 × 613.94
4. Step 4: Simplify right side
   1,709.15x = 1,574,061.81
5. Step 5: Solve for x
   x = 1,574,061.81/1,709.15
6. Step 6: Final answer
   x = 920.96