Finding the Fourth Proportional to 2,210.70, 3,321.45 and 1,663.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,210.70 : 3,321.45 = 1,663.95 : x
2. Step 2: Convert to fraction form
   2,210.70/3,321.45 = 1,663.95/x
3. Step 3: Cross multiply
   2,210.70x = 3,321.45 × 1,663.95
4. Step 4: Simplify right side
   2,210.70x = 5,526,726.73
5. Step 5: Solve for x
   x = 5,526,726.73/2,210.70
6. Step 6: Final answer
   x = 2,499.99