Finding the Fourth Proportional to 2,816.61, 3,886.76 and 1,557.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,816.61 : 3,886.76 = 1,557.59 : x
2. Step 2: Convert to fraction form
   2,816.61/3,886.76 = 1,557.59/x
3. Step 3: Cross multiply
   2,816.61x = 3,886.76 × 1,557.59
4. Step 4: Simplify right side
   2,816.61x = 6,053,978.52
5. Step 5: Solve for x
   x = 6,053,978.52/2,816.61
6. Step 6: Final answer
   x = 2,149.39