Finding the Fourth Proportional to 1,774.86, 2,449.35 and 978.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,774.86 : 2,449.35 = 978.21 : x
2. Step 2: Convert to fraction form
   1,774.86/2,449.35 = 978.21/x
3. Step 3: Cross multiply
   1,774.86x = 2,449.35 × 978.21
4. Step 4: Simplify right side
   1,774.86x = 2,395,978.66
5. Step 5: Solve for x
   x = 2,395,978.66/1,774.86
6. Step 6: Final answer
   x = 1,349.95