Finding the Fourth Proportional to 1,595.72, 2,390.88 and 978.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,595.72 : 2,390.88 = 978.13 : x
2. Step 2: Convert to fraction form
   1,595.72/2,390.88 = 978.13/x
3. Step 3: Cross multiply
   1,595.72x = 2,390.88 × 978.13
4. Step 4: Simplify right side
   1,595.72x = 2,338,591.45
5. Step 5: Solve for x
   x = 2,338,591.45/1,595.72
6. Step 6: Final answer
   x = 1,465.54