Finding the Fourth Proportional to 1,111.39, 1,667.32 and 591.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.39 : 1,667.32 = 591.71 : x
2. Step 2: Convert to fraction form
   1,111.39/1,667.32 = 591.71/x
3. Step 3: Cross multiply
   1,111.39x = 1,667.32 × 591.71
4. Step 4: Simplify right side
   1,111.39x = 986,560.10
5. Step 5: Solve for x
   x = 986,560.10/1,111.39
6. Step 6: Final answer
   x = 887.68