Finding the Fourth Proportional to 1,445.90, 1,995.34 and 782.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.90 : 1,995.34 = 782.76 : x
2. Step 2: Convert to fraction form
   1,445.90/1,995.34 = 782.76/x
3. Step 3: Cross multiply
   1,445.90x = 1,995.34 × 782.76
4. Step 4: Simplify right side
   1,445.90x = 1,561,865.54
5. Step 5: Solve for x
   x = 1,561,865.54/1,445.90
6. Step 6: Final answer
   x = 1,080.20