Finding the Fourth Proportional to 1,445.60, 1,994.79 and 816.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.60 : 1,994.79 = 816.14 : x
2. Step 2: Convert to fraction form
   1,445.60/1,994.79 = 816.14/x
3. Step 3: Cross multiply
   1,445.60x = 1,994.79 × 816.14
4. Step 4: Simplify right side
   1,445.60x = 1,628,027.91
5. Step 5: Solve for x
   x = 1,628,027.91/1,445.60
6. Step 6: Final answer
   x = 1,126.20