Finding the Fourth Proportional to 978.89, 1,460.68 and 875.31

Step by Step Solution

1. Step 1: Write the proportion equation
   978.89 : 1,460.68 = 875.31 : x
2. Step 2: Convert to fraction form
   978.89/1,460.68 = 875.31/x
3. Step 3: Cross multiply
   978.89x = 1,460.68 × 875.31
4. Step 4: Simplify right side
   978.89x = 1,278,547.09
5. Step 5: Solve for x
   x = 1,278,547.09/978.89
6. Step 6: Final answer
   x = 1,306.12