Finding the Fourth Proportional to 7,111.17, 10,666.80 and 2,180.79

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.17 : 10,666.80 = 2,180.79 : x
2. Step 2: Convert to fraction form
   7,111.17/10,666.80 = 2,180.79/x
3. Step 3: Cross multiply
   7,111.17x = 10,666.80 × 2,180.79
4. Step 4: Simplify right side
   7,111.17x = 23,262,050.77
5. Step 5: Solve for x
   x = 23,262,050.77/7,111.17
6. Step 6: Final answer
   x = 3,271.20