Finding the Fourth Proportional to 1,308.60, 1,807.49 and 978.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.60 : 1,807.49 = 978.52 : x
2. Step 2: Convert to fraction form
   1,308.60/1,807.49 = 978.52/x
3. Step 3: Cross multiply
   1,308.60x = 1,807.49 × 978.52
4. Step 4: Simplify right side
   1,308.60x = 1,768,666.15
5. Step 5: Solve for x
   x = 1,768,666.15/1,308.60
6. Step 6: Final answer
   x = 1,351.58