Finding the Fourth Proportional to 1,985.91, 2,980.68 and 1,012.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.91 : 2,980.68 = 1,012.69 : x
2. Step 2: Convert to fraction form
   1,985.91/2,980.68 = 1,012.69/x
3. Step 3: Cross multiply
   1,985.91x = 2,980.68 × 1,012.69
4. Step 4: Simplify right side
   1,985.91x = 3,018,504.83
5. Step 5: Solve for x
   x = 3,018,504.83/1,985.91
6. Step 6: Final answer
   x = 1,519.96