Finding the Fourth Proportional to 1,567.76, 2,161.83 and 978.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,567.76 : 2,161.83 = 978.14 : x
2. Step 2: Convert to fraction form
   1,567.76/2,161.83 = 978.14/x
3. Step 3: Cross multiply
   1,567.76x = 2,161.83 × 978.14
4. Step 4: Simplify right side
   1,567.76x = 2,114,572.40
5. Step 5: Solve for x
   x = 2,114,572.40/1,567.76
6. Step 6: Final answer
   x = 1,348.79