Finding the Fourth Proportional to 1,384.32, 1,912.56 and 1,054.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.32 : 1,912.56 = 1,054.08 : x
2. Step 2: Convert to fraction form
   1,384.32/1,912.56 = 1,054.08/x
3. Step 3: Cross multiply
   1,384.32x = 1,912.56 × 1,054.08
4. Step 4: Simplify right side
   1,384.32x = 2,015,991.24
5. Step 5: Solve for x
   x = 2,015,991.24/1,384.32
6. Step 6: Final answer
   x = 1,456.30