Finding the Fourth Proportional to 2,653.81, 3,981.51 and 1,071.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.81 : 3,981.51 = 1,071.72 : x
2. Step 2: Convert to fraction form
   2,653.81/3,981.51 = 1,071.72/x
3. Step 3: Cross multiply
   2,653.81x = 3,981.51 × 1,071.72
4. Step 4: Simplify right side
   2,653.81x = 4,267,063.90
5. Step 5: Solve for x
   x = 4,267,063.90/2,653.81
6. Step 6: Final answer
   x = 1,607.90