Finding the Fourth Proportional to 1,890.76, 2,610.84 and 1,228.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.76 : 2,610.84 = 1,228.76 : x
2. Step 2: Convert to fraction form
   1,890.76/2,610.84 = 1,228.76/x
3. Step 3: Cross multiply
   1,890.76x = 2,610.84 × 1,228.76
4. Step 4: Simplify right side
   1,890.76x = 3,208,095.76
5. Step 5: Solve for x
   x = 3,208,095.76/1,890.76
6. Step 6: Final answer
   x = 1,696.72