Finding the Fourth Proportional to 1,567.35, 2,164.32 and 978.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,567.35 : 2,164.32 = 978.89 : x
2. Step 2: Convert to fraction form
   1,567.35/2,164.32 = 978.89/x
3. Step 3: Cross multiply
   1,567.35x = 2,164.32 × 978.89
4. Step 4: Simplify right side
   1,567.35x = 2,118,620.38
5. Step 5: Solve for x
   x = 2,118,620.38/1,567.35
6. Step 6: Final answer
   x = 1,351.72