Finding the Fourth Proportional to 1,715.64, 2,571.49 and 779.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,715.64 : 2,571.49 = 779.34 : x
2. Step 2: Convert to fraction form
   1,715.64/2,571.49 = 779.34/x
3. Step 3: Cross multiply
   1,715.64x = 2,571.49 × 779.34
4. Step 4: Simplify right side
   1,715.64x = 2,004,065.02
5. Step 5: Solve for x
   x = 2,004,065.02/1,715.64
6. Step 6: Final answer
   x = 1,168.12