Finding the Fourth Proportional to 1,445.58, 1,994.90 and 782.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.58 : 1,994.90 = 782.43 : x
2. Step 2: Convert to fraction form
   1,445.58/1,994.90 = 782.43/x
3. Step 3: Cross multiply
   1,445.58x = 1,994.90 × 782.43
4. Step 4: Simplify right side
   1,445.58x = 1,560,869.61
5. Step 5: Solve for x
   x = 1,560,869.61/1,445.58
6. Step 6: Final answer
   x = 1,079.75