Finding the Fourth Proportional to 1,985.69, 2,978.19 and 1,109.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.69 : 2,978.19 = 1,109.07 : x
2. Step 2: Convert to fraction form
   1,985.69/2,978.19 = 1,109.07/x
3. Step 3: Cross multiply
   1,985.69x = 2,978.19 × 1,109.07
4. Step 4: Simplify right side
   1,985.69x = 3,303,015.93
5. Step 5: Solve for x
   x = 3,303,015.93/1,985.69
6. Step 6: Final answer
   x = 1,663.41