Finding the Fourth Proportional to 2,311.05, 3,188.79 and 1,316.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.05 : 3,188.79 = 1,316.07 : x
2. Step 2: Convert to fraction form
   2,311.05/3,188.79 = 1,316.07/x
3. Step 3: Cross multiply
   2,311.05x = 3,188.79 × 1,316.07
4. Step 4: Simplify right side
   2,311.05x = 4,196,670.86
5. Step 5: Solve for x
   x = 4,196,670.86/2,311.05
6. Step 6: Final answer
   x = 1,815.92