Finding the Fourth Proportional to 1,303.89, 1,799.58 and 780.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,303.89 : 1,799.58 = 780.02 : x
2. Step 2: Convert to fraction form
   1,303.89/1,799.58 = 780.02/x
3. Step 3: Cross multiply
   1,303.89x = 1,799.58 × 780.02
4. Step 4: Simplify right side
   1,303.89x = 1,403,708.39
5. Step 5: Solve for x
   x = 1,403,708.39/1,303.89
6. Step 6: Final answer
   x = 1,076.55