Finding the Fourth Proportional to 1,985.22, 2,980.76 and 1,109.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.22 : 2,980.76 = 1,109.43 : x
2. Step 2: Convert to fraction form
   1,985.22/2,980.76 = 1,109.43/x
3. Step 3: Cross multiply
   1,985.22x = 2,980.76 × 1,109.43
4. Step 4: Simplify right side
   1,985.22x = 3,306,939.02
5. Step 5: Solve for x
   x = 3,306,939.02/1,985.22
6. Step 6: Final answer
   x = 1,665.78