Finding the Fourth Proportional to 1,931.56, 2,895.72 and 778.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.56 : 2,895.72 = 778.12 : x
2. Step 2: Convert to fraction form
   1,931.56/2,895.72 = 778.12/x
3. Step 3: Cross multiply
   1,931.56x = 2,895.72 × 778.12
4. Step 4: Simplify right side
   1,931.56x = 2,253,217.65
5. Step 5: Solve for x
   x = 2,253,217.65/1,931.56
6. Step 6: Final answer
   x = 1,166.53