Finding the Fourth Proportional to 3,869.32, 5,339.72 and 2,100.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,869.32 : 5,339.72 = 2,100.96 : x
2. Step 2: Convert to fraction form
   3,869.32/5,339.72 = 2,100.96/x
3. Step 3: Cross multiply
   3,869.32x = 5,339.72 × 2,100.96
4. Step 4: Simplify right side
   3,869.32x = 11,218,538.13
5. Step 5: Solve for x
   x = 11,218,538.13/3,869.32
6. Step 6: Final answer
   x = 2,899.36