Finding the Fourth Proportional to 2,926.51, 4,389.80 and 978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,926.51 : 4,389.80 = 978.72 : x
2. Step 2: Convert to fraction form
   2,926.51/4,389.80 = 978.72/x
3. Step 3: Cross multiply
   2,926.51x = 4,389.80 × 978.72
4. Step 4: Simplify right side
   2,926.51x = 4,296,385.06
5. Step 5: Solve for x
   x = 4,296,385.06/2,926.51
6. Step 6: Final answer
   x = 1,468.09