Finding the Fourth Proportional to 2,591.64, 3,888.90 and 1,053.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.64 : 3,888.90 = 1,053.72 : x
2. Step 2: Convert to fraction form
   2,591.64/3,888.90 = 1,053.72/x
3. Step 3: Cross multiply
   2,591.64x = 3,888.90 × 1,053.72
4. Step 4: Simplify right side
   2,591.64x = 4,097,811.71
5. Step 5: Solve for x
   x = 4,097,811.71/2,591.64
6. Step 6: Final answer
   x = 1,581.17