Finding the Fourth Proportional to 1,819.09, 2,510.16 and 1,221.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,819.09 : 2,510.16 = 1,221.47 : x
2. Step 2: Convert to fraction form
   1,819.09/2,510.16 = 1,221.47/x
3. Step 3: Cross multiply
   1,819.09x = 2,510.16 × 1,221.47
4. Step 4: Simplify right side
   1,819.09x = 3,066,077.42
5. Step 5: Solve for x
   x = 3,066,077.42/1,819.09
6. Step 6: Final answer
   x = 1,685.50