Finding the Fourth Proportional to 1,556.30, 2,147.78 and 966.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.30 : 2,147.78 = 966.72 : x
2. Step 2: Convert to fraction form
   1,556.30/2,147.78 = 966.72/x
3. Step 3: Cross multiply
   1,556.30x = 2,147.78 × 966.72
4. Step 4: Simplify right side
   1,556.30x = 2,076,301.88
5. Step 5: Solve for x
   x = 2,076,301.88/1,556.30
6. Step 6: Final answer
   x = 1,334.13