Finding the Fourth Proportional to 2,188.35, 3,278.21 and 1,263.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.35 : 3,278.21 = 1,263.33 : x
2. Step 2: Convert to fraction form
   2,188.35/3,278.21 = 1,263.33/x
3. Step 3: Cross multiply
   2,188.35x = 3,278.21 × 1,263.33
4. Step 4: Simplify right side
   2,188.35x = 4,141,454.72
5. Step 5: Solve for x
   x = 4,141,454.72/2,188.35
6. Step 6: Final answer
   x = 1,892.50