Finding the Fourth Proportional to 13,925.88, 19,217.61 and 7,638.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,925.88 : 19,217.61 = 7,638.21 : x
2. Step 2: Convert to fraction form
   13,925.88/19,217.61 = 7,638.21/x
3. Step 3: Cross multiply
   13,925.88x = 19,217.61 × 7,638.21
4. Step 4: Simplify right side
   13,925.88x = 146,788,140.88
5. Step 5: Solve for x
   x = 146,788,140.88/13,925.88
6. Step 6: Final answer
   x = 10,540.67