Finding the Fourth Proportional to 1,525.36, 2,291.69 and 978.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,525.36 : 2,291.69 = 978.61 : x
2. Step 2: Convert to fraction form
   1,525.36/2,291.69 = 978.61/x
3. Step 3: Cross multiply
   1,525.36x = 2,291.69 × 978.61
4. Step 4: Simplify right side
   1,525.36x = 2,242,665.86
5. Step 5: Solve for x
   x = 2,242,665.86/1,525.36
6. Step 6: Final answer
   x = 1,470.25