Finding the Fourth Proportional to 4,978.07, 6,866.87 and 3,111.83

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.07 : 6,866.87 = 3,111.83 : x
2. Step 2: Convert to fraction form
   4,978.07/6,866.87 = 3,111.83/x
3. Step 3: Cross multiply
   4,978.07x = 6,866.87 × 3,111.83
4. Step 4: Simplify right side
   4,978.07x = 21,368,482.18
5. Step 5: Solve for x
   x = 21,368,482.18/4,978.07
6. Step 6: Final answer
   x = 4,292.53