Finding the Fourth Proportional to 2,978.51, 4,467.96 and 870.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.51 : 4,467.96 = 870.17 : x
2. Step 2: Convert to fraction form
   2,978.51/4,467.96 = 870.17/x
3. Step 3: Cross multiply
   2,978.51x = 4,467.96 × 870.17
4. Step 4: Simplify right side
   2,978.51x = 3,887,862.41
5. Step 5: Solve for x
   x = 3,887,862.41/2,978.51
6. Step 6: Final answer
   x = 1,305.31