Finding the Fourth Proportional to 1,985.78, 2,979.52 and 945.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.78 : 2,979.52 = 945.77 : x
2. Step 2: Convert to fraction form
   1,985.78/2,979.52 = 945.77/x
3. Step 3: Cross multiply
   1,985.78x = 2,979.52 × 945.77
4. Step 4: Simplify right side
   1,985.78x = 2,817,923.37
5. Step 5: Solve for x
   x = 2,817,923.37/1,985.78
6. Step 6: Final answer
   x = 1,419.05