Finding the Fourth Proportional to 12,990.24, 17,925.21 and 7,684.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.24 : 17,925.21 = 7,684.02 : x
2. Step 2: Convert to fraction form
   12,990.24/17,925.21 = 7,684.02/x
3. Step 3: Cross multiply
   12,990.24x = 17,925.21 × 7,684.02
4. Step 4: Simplify right side
   12,990.24x = 137,737,672.14
5. Step 5: Solve for x
   x = 137,737,672.14/12,990.24
6. Step 6: Final answer
   x = 10,603.17