Finding the Fourth Proportional to 2,187.90, 3,019.31 and 1,303.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.90 : 3,019.31 = 1,303.72 : x
2. Step 2: Convert to fraction form
   2,187.90/3,019.31 = 1,303.72/x
3. Step 3: Cross multiply
   2,187.90x = 3,019.31 × 1,303.72
4. Step 4: Simplify right side
   2,187.90x = 3,936,334.83
5. Step 5: Solve for x
   x = 3,936,334.83/2,187.90
6. Step 6: Final answer
   x = 1,799.14