Finding the Fourth Proportional to 2,981.10, 4,179.30 and 2,981.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,981.10 : 4,179.30 = 2,981.10 : x
2. Step 2: Convert to fraction form
   2,981.10/4,179.30 = 2,981.10/x
3. Step 3: Cross multiply
   2,981.10x = 4,179.30 × 2,981.10
4. Step 4: Simplify right side
   2,981.10x = 12,458,911.23
5. Step 5: Solve for x
   x = 12,458,911.23/2,981.10
6. Step 6: Final answer
   x = 4,179.30