Finding the Fourth Proportional to 1,347.58, 2,018.31 and 978.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.58 : 2,018.31 = 978.58 : x
2. Step 2: Convert to fraction form
   1,347.58/2,018.31 = 978.58/x
3. Step 3: Cross multiply
   1,347.58x = 2,018.31 × 978.58
4. Step 4: Simplify right side
   1,347.58x = 1,975,077.80
5. Step 5: Solve for x
   x = 1,975,077.80/1,347.58
6. Step 6: Final answer
   x = 1,465.65