Finding the Fourth Proportional to 11,501.60, 15,864.72 and 9,402.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,501.60 : 15,864.72 = 9,402.40 : x
2. Step 2: Convert to fraction form
   11,501.60/15,864.72 = 9,402.40/x
3. Step 3: Cross multiply
   11,501.60x = 15,864.72 × 9,402.40
4. Step 4: Simplify right side
   11,501.60x = 149,166,443.33
5. Step 5: Solve for x
   x = 149,166,443.33/11,501.60
6. Step 6: Final answer
   x = 12,969.19