Finding the Fourth Proportional to 25,590.69, 35,315.28 and 14,978.25

Step by Step Solution

1. Step 1: Write the proportion equation
   25,590.69 : 35,315.28 = 14,978.25 : x
2. Step 2: Convert to fraction form
   25,590.69/35,315.28 = 14,978.25/x
3. Step 3: Cross multiply
   25,590.69x = 35,315.28 × 14,978.25
4. Step 4: Simplify right side
   25,590.69x = 528,961,092.66
5. Step 5: Solve for x
   x = 528,961,092.66/25,590.69
6. Step 6: Final answer
   x = 20,670.06