Finding the Fourth Proportional to 1,659.72, 2,288.34 and 1,396.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.72 : 2,288.34 = 1,396.20 : x
2. Step 2: Convert to fraction form
   1,659.72/2,288.34 = 1,396.20/x
3. Step 3: Cross multiply
   1,659.72x = 2,288.34 × 1,396.20
4. Step 4: Simplify right side
   1,659.72x = 3,194,980.31
5. Step 5: Solve for x
   x = 3,194,980.31/1,659.72
6. Step 6: Final answer
   x = 1,925.01