Finding the Fourth Proportional to 2,926.55, 4,389.86 and 978.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,926.55 : 4,389.86 = 978.75 : x
2. Step 2: Convert to fraction form
   2,926.55/4,389.86 = 978.75/x
3. Step 3: Cross multiply
   2,926.55x = 4,389.86 × 978.75
4. Step 4: Simplify right side
   2,926.55x = 4,296,577.92
5. Step 5: Solve for x
   x = 4,296,577.92/2,926.55
6. Step 6: Final answer
   x = 1,468.14