Finding the Fourth Proportional to 1,189.30, 1,784.37 and 1,054.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.30 : 1,784.37 = 1,054.03 : x
2. Step 2: Convert to fraction form
   1,189.30/1,784.37 = 1,054.03/x
3. Step 3: Cross multiply
   1,189.30x = 1,784.37 × 1,054.03
4. Step 4: Simplify right side
   1,189.30x = 1,880,779.51
5. Step 5: Solve for x
   x = 1,880,779.51/1,189.30
6. Step 6: Final answer
   x = 1,581.42