Finding the Fourth Proportional to 1,139.91, 1,707.77 and 591.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.91 : 1,707.77 = 591.51 : x
2. Step 2: Convert to fraction form
   1,139.91/1,707.77 = 591.51/x
3. Step 3: Cross multiply
   1,139.91x = 1,707.77 × 591.51
4. Step 4: Simplify right side
   1,139.91x = 1,010,160.08
5. Step 5: Solve for x
   x = 1,010,160.08/1,139.91
6. Step 6: Final answer
   x = 886.18