Finding the Fourth Proportional to 1,445.49, 1,992.83 and 978.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.49 : 1,992.83 = 978.93 : x
2. Step 2: Convert to fraction form
   1,445.49/1,992.83 = 978.93/x
3. Step 3: Cross multiply
   1,445.49x = 1,992.83 × 978.93
4. Step 4: Simplify right side
   1,445.49x = 1,950,836.18
5. Step 5: Solve for x
   x = 1,950,836.18/1,445.49
6. Step 6: Final answer
   x = 1,349.60