Finding the Fourth Proportional to 1,487.28, 2,054.20 and 1,189.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,487.28 : 2,054.20 = 1,189.56 : x
2. Step 2: Convert to fraction form
   1,487.28/2,054.20 = 1,189.56/x
3. Step 3: Cross multiply
   1,487.28x = 2,054.20 × 1,189.56
4. Step 4: Simplify right side
   1,487.28x = 2,443,591.18
5. Step 5: Solve for x
   x = 2,443,591.18/1,487.28
6. Step 6: Final answer
   x = 1,642.99