Finding the Fourth Proportional to 1,145.92, 1,725.04 and 978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.92 : 1,725.04 = 978.88 : x
2. Step 2: Convert to fraction form
   1,145.92/1,725.04 = 978.88/x
3. Step 3: Cross multiply
   1,145.92x = 1,725.04 × 978.88
4. Step 4: Simplify right side
   1,145.92x = 1,688,607.16
5. Step 5: Solve for x
   x = 1,688,607.16/1,145.92
6. Step 6: Final answer
   x = 1,473.58