Finding the Fourth Proportional to 1,567.71, 2,164.01 and 978.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,567.71 : 2,164.01 = 978.03 : x
2. Step 2: Convert to fraction form
   1,567.71/2,164.01 = 978.03/x
3. Step 3: Cross multiply
   1,567.71x = 2,164.01 × 978.03
4. Step 4: Simplify right side
   1,567.71x = 2,116,461.81
5. Step 5: Solve for x
   x = 2,116,461.81/1,567.71
6. Step 6: Final answer
   x = 1,350.03