Finding the Fourth Proportional to 1,556.20, 2,141.94 and 1,089.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.20 : 2,141.94 = 1,089.64 : x
2. Step 2: Convert to fraction form
   1,556.20/2,141.94 = 1,089.64/x
3. Step 3: Cross multiply
   1,556.20x = 2,141.94 × 1,089.64
4. Step 4: Simplify right side
   1,556.20x = 2,333,943.50
5. Step 5: Solve for x
   x = 2,333,943.50/1,556.20
6. Step 6: Final answer
   x = 1,499.77