Finding the Fourth Proportional to 16,990.72, 25,484.82 and 7,129.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,990.72 : 25,484.82 = 7,129.60 : x
2. Step 2: Convert to fraction form
   16,990.72/25,484.82 = 7,129.60/x
3. Step 3: Cross multiply
   16,990.72x = 25,484.82 × 7,129.60
4. Step 4: Simplify right side
   16,990.72x = 181,696,572.67
5. Step 5: Solve for x
   x = 181,696,572.67/16,990.72
6. Step 6: Final answer
   x = 10,693.87