Finding the Fourth Proportional to 3,611.79, 5,422.71 and 1,858.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,611.79 : 5,422.71 = 1,858.28 : x
2. Step 2: Convert to fraction form
   3,611.79/5,422.71 = 1,858.28/x
3. Step 3: Cross multiply
   3,611.79x = 5,422.71 × 1,858.28
4. Step 4: Simplify right side
   3,611.79x = 10,076,893.39
5. Step 5: Solve for x
   x = 10,076,893.39/3,611.79
6. Step 6: Final answer
   x = 2,790.00