Finding the Fourth Proportional to 1,139.25, 1,709.01 and 591.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.25 : 1,709.01 = 591.15 : x
2. Step 2: Convert to fraction form
   1,139.25/1,709.01 = 591.15/x
3. Step 3: Cross multiply
   1,139.25x = 1,709.01 × 591.15
4. Step 4: Simplify right side
   1,139.25x = 1,010,281.26
5. Step 5: Solve for x
   x = 1,010,281.26/1,139.25
6. Step 6: Final answer
   x = 886.80