Finding the Fourth Proportional to 15,479.34, 21,379.05 and 10,434.89

Step by Step Solution

1. Step 1: Write the proportion equation
   15,479.34 : 21,379.05 = 10,434.89 : x
2. Step 2: Convert to fraction form
   15,479.34/21,379.05 = 10,434.89/x
3. Step 3: Cross multiply
   15,479.34x = 21,379.05 × 10,434.89
4. Step 4: Simplify right side
   15,479.34x = 223,088,035.05
5. Step 5: Solve for x
   x = 223,088,035.05/15,479.34
6. Step 6: Final answer
   x = 14,411.99