Finding the Fourth Proportional to 1,567.95, 2,162.80 and 978.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,567.95 : 2,162.80 = 978.37 : x
2. Step 2: Convert to fraction form
   1,567.95/2,162.80 = 978.37/x
3. Step 3: Cross multiply
   1,567.95x = 2,162.80 × 978.37
4. Step 4: Simplify right side
   1,567.95x = 2,116,018.64
5. Step 5: Solve for x
   x = 2,116,018.64/1,567.95
6. Step 6: Final answer
   x = 1,349.54