Finding the Fourth Proportional to 1,993.50, 2,987.78 and 1,263.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,993.50 : 2,987.78 = 1,263.28 : x
2. Step 2: Convert to fraction form
   1,993.50/2,987.78 = 1,263.28/x
3. Step 3: Cross multiply
   1,993.50x = 2,987.78 × 1,263.28
4. Step 4: Simplify right side
   1,993.50x = 3,774,402.72
5. Step 5: Solve for x
   x = 3,774,402.72/1,993.50
6. Step 6: Final answer
   x = 1,893.35