Finding the Fourth Proportional to 2,086.69, 3,130.57 and 788.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.69 : 3,130.57 = 788.17 : x
2. Step 2: Convert to fraction form
   2,086.69/3,130.57 = 788.17/x
3. Step 3: Cross multiply
   2,086.69x = 3,130.57 × 788.17
4. Step 4: Simplify right side
   2,086.69x = 2,467,421.36
5. Step 5: Solve for x
   x = 2,467,421.36/2,086.69
6. Step 6: Final answer
   x = 1,182.46