Finding the Fourth Proportional to 1,985.29, 2,978.05 and 668.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.29 : 2,978.05 = 668.93 : x
2. Step 2: Convert to fraction form
   1,985.29/2,978.05 = 668.93/x
3. Step 3: Cross multiply
   1,985.29x = 2,978.05 × 668.93
4. Step 4: Simplify right side
   1,985.29x = 1,992,105.31
5. Step 5: Solve for x
   x = 1,992,105.31/1,985.29
6. Step 6: Final answer
   x = 1,003.43