Finding the Fourth Proportional to 2,611.32, 3,914.55 and 2,120.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.32 : 3,914.55 = 2,120.46 : x
2. Step 2: Convert to fraction form
   2,611.32/3,914.55 = 2,120.46/x
3. Step 3: Cross multiply
   2,611.32x = 3,914.55 × 2,120.46
4. Step 4: Simplify right side
   2,611.32x = 8,300,646.69
5. Step 5: Solve for x
   x = 8,300,646.69/2,611.32
6. Step 6: Final answer
   x = 3,178.72