Finding the Fourth Proportional to 1,556.55, 2,147.72 and 966.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.55 : 2,147.72 = 966.74 : x
2. Step 2: Convert to fraction form
   1,556.55/2,147.72 = 966.74/x
3. Step 3: Cross multiply
   1,556.55x = 2,147.72 × 966.74
4. Step 4: Simplify right side
   1,556.55x = 2,076,271.26
5. Step 5: Solve for x
   x = 2,076,271.26/1,556.55
6. Step 6: Final answer
   x = 1,333.89