Finding the Fourth Proportional to 1,886.72, 2,817.52 and 1,866.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,886.72 : 2,817.52 = 1,866.40 : x
2. Step 2: Convert to fraction form
   1,886.72/2,817.52 = 1,866.40/x
3. Step 3: Cross multiply
   1,886.72x = 2,817.52 × 1,866.40
4. Step 4: Simplify right side
   1,886.72x = 5,258,619.33
5. Step 5: Solve for x
   x = 5,258,619.33/1,886.72
6. Step 6: Final answer
   x = 2,787.18