Finding the Fourth Proportional to 15,456.18, 21,325.92 and 10,429.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,456.18 : 21,325.92 = 10,429.72 : x
2. Step 2: Convert to fraction form
   15,456.18/21,325.92 = 10,429.72/x
3. Step 3: Cross multiply
   15,456.18x = 21,325.92 × 10,429.72
4. Step 4: Simplify right side
   15,456.18x = 222,423,374.34
5. Step 5: Solve for x
   x = 222,423,374.34/15,456.18
6. Step 6: Final answer
   x = 14,390.58