Finding the Fourth Proportional to 1,802.86, 2,488.89 and 1,213.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,802.86 : 2,488.89 = 1,213.72 : x
2. Step 2: Convert to fraction form
   1,802.86/2,488.89 = 1,213.72/x
3. Step 3: Cross multiply
   1,802.86x = 2,488.89 × 1,213.72
4. Step 4: Simplify right side
   1,802.86x = 3,020,815.57
5. Step 5: Solve for x
   x = 3,020,815.57/1,802.86
6. Step 6: Final answer
   x = 1,675.57