Finding the Fourth Proportional to 2,621.33, 3,926.71 and 1,213.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.33 : 3,926.71 = 1,213.76 : x
2. Step 2: Convert to fraction form
   2,621.33/3,926.71 = 1,213.76/x
3. Step 3: Cross multiply
   2,621.33x = 3,926.71 × 1,213.76
4. Step 4: Simplify right side
   2,621.33x = 4,766,090.31
5. Step 5: Solve for x
   x = 4,766,090.31/2,621.33
6. Step 6: Final answer
   x = 1,818.20