Finding the Fourth Proportional to 1,590.72, 2,387.20 and 1,071.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,590.72 : 2,387.20 = 1,071.72 : x
2. Step 2: Convert to fraction form
   1,590.72/2,387.20 = 1,071.72/x
3. Step 3: Cross multiply
   1,590.72x = 2,387.20 × 1,071.72
4. Step 4: Simplify right side
   1,590.72x = 2,558,409.98
5. Step 5: Solve for x
   x = 2,558,409.98/1,590.72
6. Step 6: Final answer
   x = 1,608.33