Finding the Fourth Proportional to 1,672.35, 2,307.78 and 964.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.35 : 2,307.78 = 964.05 : x
2. Step 2: Convert to fraction form
   1,672.35/2,307.78 = 964.05/x
3. Step 3: Cross multiply
   1,672.35x = 2,307.78 × 964.05
4. Step 4: Simplify right side
   1,672.35x = 2,224,815.31
5. Step 5: Solve for x
   x = 2,224,815.31/1,672.35
6. Step 6: Final answer
   x = 1,330.35