Finding the Fourth Proportional to 1,404.20, 1,939.20 and 1,157.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.20 : 1,939.20 = 1,157.96 : x
2. Step 2: Convert to fraction form
   1,404.20/1,939.20 = 1,157.96/x
3. Step 3: Cross multiply
   1,404.20x = 1,939.20 × 1,157.96
4. Step 4: Simplify right side
   1,404.20x = 2,245,516.03
5. Step 5: Solve for x
   x = 2,245,516.03/1,404.20
6. Step 6: Final answer
   x = 1,599.14