Finding the Fourth Proportional to 1,420.94, 1,960.00 and 978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.94 : 1,960.00 = 978.08 : x
2. Step 2: Convert to fraction form
   1,420.94/1,960.00 = 978.08/x
3. Step 3: Cross multiply
   1,420.94x = 1,960.00 × 978.08
4. Step 4: Simplify right side
   1,420.94x = 1,917,024.55
5. Step 5: Solve for x
   x = 1,917,024.55/1,420.94
6. Step 6: Final answer
   x = 1,349.12