Finding the Fourth Proportional to 1,588.72, 2,191.80 and 959.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,588.72 : 2,191.80 = 959.08 : x
2. Step 2: Convert to fraction form
   1,588.72/2,191.80 = 959.08/x
3. Step 3: Cross multiply
   1,588.72x = 2,191.80 × 959.08
4. Step 4: Simplify right side
   1,588.72x = 2,102,111.54
5. Step 5: Solve for x
   x = 2,102,111.54/1,588.72
6. Step 6: Final answer
   x = 1,323.15