Finding the Fourth Proportional to 2,621.64, 3,927.85 and 1,386.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.64 : 3,927.85 = 1,386.34 : x
2. Step 2: Convert to fraction form
   2,621.64/3,927.85 = 1,386.34/x
3. Step 3: Cross multiply
   2,621.64x = 3,927.85 × 1,386.34
4. Step 4: Simplify right side
   2,621.64x = 5,445,322.28
5. Step 5: Solve for x
   x = 5,445,322.28/2,621.64
6. Step 6: Final answer
   x = 2,077.06