Finding the Fourth Proportional to 1,421.56, 1,962.72 and 1,160.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.56 : 1,962.72 = 1,160.20 : x
2. Step 2: Convert to fraction form
   1,421.56/1,962.72 = 1,160.20/x
3. Step 3: Cross multiply
   1,421.56x = 1,962.72 × 1,160.20
4. Step 4: Simplify right side
   1,421.56x = 2,277,147.74
5. Step 5: Solve for x
   x = 2,277,147.74/1,421.56
6. Step 6: Final answer
   x = 1,601.87