Finding the Fourth Proportional to 1,245.89, 1,718.33 and 1,207.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.89 : 1,718.33 = 1,207.82 : x
2. Step 2: Convert to fraction form
   1,245.89/1,718.33 = 1,207.82/x
3. Step 3: Cross multiply
   1,245.89x = 1,718.33 × 1,207.82
4. Step 4: Simplify right side
   1,245.89x = 2,075,418.71
5. Step 5: Solve for x
   x = 2,075,418.71/1,245.89
6. Step 6: Final answer
   x = 1,665.82