Finding the Fourth Proportional to 1,567.96, 2,164.20 and 978.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,567.96 : 2,164.20 = 978.14 : x
2. Step 2: Convert to fraction form
   1,567.96/2,164.20 = 978.14/x
3. Step 3: Cross multiply
   1,567.96x = 2,164.20 × 978.14
4. Step 4: Simplify right side
   1,567.96x = 2,116,890.59
5. Step 5: Solve for x
   x = 2,116,890.59/1,567.96
6. Step 6: Final answer
   x = 1,350.10