Finding the Fourth Proportional to 1,569.04, 2,164.59 and 978.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,569.04 : 2,164.59 = 978.55 : x
2. Step 2: Convert to fraction form
   1,569.04/2,164.59 = 978.55/x
3. Step 3: Cross multiply
   1,569.04x = 2,164.59 × 978.55
4. Step 4: Simplify right side
   1,569.04x = 2,118,154.13
5. Step 5: Solve for x
   x = 2,118,154.13/1,569.04
6. Step 6: Final answer
   x = 1,349.97