Finding the Fourth Proportional to 2,279.04, 3,415.72 and 978.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.04 : 3,415.72 = 978.99 : x
2. Step 2: Convert to fraction form
   2,279.04/3,415.72 = 978.99/x
3. Step 3: Cross multiply
   2,279.04x = 3,415.72 × 978.99
4. Step 4: Simplify right side
   2,279.04x = 3,343,955.72
5. Step 5: Solve for x
   x = 3,343,955.72/2,279.04
6. Step 6: Final answer
   x = 1,467.27