Finding the Fourth Proportional to 1,388.73, 1,914.41 and 1,056.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.73 : 1,914.41 = 1,056.58 : x
2. Step 2: Convert to fraction form
   1,388.73/1,914.41 = 1,056.58/x
3. Step 3: Cross multiply
   1,388.73x = 1,914.41 × 1,056.58
4. Step 4: Simplify right side
   1,388.73x = 2,022,717.75
5. Step 5: Solve for x
   x = 2,022,717.75/1,388.73
6. Step 6: Final answer
   x = 1,456.53