Finding the Fourth Proportional to 1,590.31, 2,194.73 and 891.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,590.31 : 2,194.73 = 891.69 : x
2. Step 2: Convert to fraction form
   1,590.31/2,194.73 = 891.69/x
3. Step 3: Cross multiply
   1,590.31x = 2,194.73 × 891.69
4. Step 4: Simplify right side
   1,590.31x = 1,957,018.79
5. Step 5: Solve for x
   x = 1,957,018.79/1,590.31
6. Step 6: Final answer
   x = 1,230.59