Finding the Fourth Proportional to 1,921.56, 2,651.67 and 1,176.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.56 : 2,651.67 = 1,176.78 : x
2. Step 2: Convert to fraction form
   1,921.56/2,651.67 = 1,176.78/x
3. Step 3: Cross multiply
   1,921.56x = 2,651.67 × 1,176.78
4. Step 4: Simplify right side
   1,921.56x = 3,120,432.22
5. Step 5: Solve for x
   x = 3,120,432.22/1,921.56
6. Step 6: Final answer
   x = 1,623.91