Finding the Fourth Proportional to 1,627.68, 2,445.24 and 978.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,627.68 : 2,445.24 = 978.84 : x
2. Step 2: Convert to fraction form
   1,627.68/2,445.24 = 978.84/x
3. Step 3: Cross multiply
   1,627.68x = 2,445.24 × 978.84
4. Step 4: Simplify right side
   1,627.68x = 2,393,498.72
5. Step 5: Solve for x
   x = 2,393,498.72/1,627.68
6. Step 6: Final answer
   x = 1,470.50