Finding the Fourth Proportional to 1,445.60, 1,994.91 and 782.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.60 : 1,994.91 = 782.46 : x
2. Step 2: Convert to fraction form
   1,445.60/1,994.91 = 782.46/x
3. Step 3: Cross multiply
   1,445.60x = 1,994.91 × 782.46
4. Step 4: Simplify right side
   1,445.60x = 1,560,927.30
5. Step 5: Solve for x
   x = 1,560,927.30/1,445.60
6. Step 6: Final answer
   x = 1,079.78