Finding the Fourth Proportional to 3,139.32, 4,707.16 and 1,191.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.32 : 4,707.16 = 1,191.68 : x
2. Step 2: Convert to fraction form
   3,139.32/4,707.16 = 1,191.68/x
3. Step 3: Cross multiply
   3,139.32x = 4,707.16 × 1,191.68
4. Step 4: Simplify right side
   3,139.32x = 5,609,428.43
5. Step 5: Solve for x
   x = 5,609,428.43/3,139.32
6. Step 6: Final answer
   x = 1,786.83