Finding the Fourth Proportional to 1,986.45, 2,980.05 and 1,155.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.45 : 2,980.05 = 1,155.30 : x
2. Step 2: Convert to fraction form
   1,986.45/2,980.05 = 1,155.30/x
3. Step 3: Cross multiply
   1,986.45x = 2,980.05 × 1,155.30
4. Step 4: Simplify right side
   1,986.45x = 3,442,851.77
5. Step 5: Solve for x
   x = 3,442,851.77/1,986.45
6. Step 6: Final answer
   x = 1,733.17