Finding the Fourth Proportional to 15,372.96, 21,210.77 and 9,402.45

Step by Step Solution

1. Step 1: Write the proportion equation
   15,372.96 : 21,210.77 = 9,402.45 : x
2. Step 2: Convert to fraction form
   15,372.96/21,210.77 = 9,402.45/x
3. Step 3: Cross multiply
   15,372.96x = 21,210.77 × 9,402.45
4. Step 4: Simplify right side
   15,372.96x = 199,433,227.89
5. Step 5: Solve for x
   x = 199,433,227.89/15,372.96
6. Step 6: Final answer
   x = 12,972.99