Finding the Fourth Proportional to 2,978.72, 4,468.26 and 870.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.72 : 4,468.26 = 870.41 : x
2. Step 2: Convert to fraction form
   2,978.72/4,468.26 = 870.41/x
3. Step 3: Cross multiply
   2,978.72x = 4,468.26 × 870.41
4. Step 4: Simplify right side
   2,978.72x = 3,889,218.19
5. Step 5: Solve for x
   x = 3,889,218.19/2,978.72
6. Step 6: Final answer
   x = 1,305.67