Finding the Fourth Proportional to 13,931.98, 19,225.96 and 7,644.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,931.98 : 19,225.96 = 7,644.35 : x
2. Step 2: Convert to fraction form
   13,931.98/19,225.96 = 7,644.35/x
3. Step 3: Cross multiply
   13,931.98x = 19,225.96 × 7,644.35
4. Step 4: Simplify right side
   13,931.98x = 146,969,967.33
5. Step 5: Solve for x
   x = 146,969,967.33/13,931.98
6. Step 6: Final answer
   x = 10,549.11