Finding the Fourth Proportional to 1,445.89, 1,995.36 and 782.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.89 : 1,995.36 = 782.74 : x
2. Step 2: Convert to fraction form
   1,445.89/1,995.36 = 782.74/x
3. Step 3: Cross multiply
   1,445.89x = 1,995.36 × 782.74
4. Step 4: Simplify right side
   1,445.89x = 1,561,848.09
5. Step 5: Solve for x
   x = 1,561,848.09/1,445.89
6. Step 6: Final answer
   x = 1,080.20