Finding the Fourth Proportional to 2,978.19, 4,111.22 and 2,143.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.19 : 4,111.22 = 2,143.08 : x
2. Step 2: Convert to fraction form
   2,978.19/4,111.22 = 2,143.08/x
3. Step 3: Cross multiply
   2,978.19x = 4,111.22 × 2,143.08
4. Step 4: Simplify right side
   2,978.19x = 8,810,678.72
5. Step 5: Solve for x
   x = 8,810,678.72/2,978.19
6. Step 6: Final answer
   x = 2,958.40