Finding the Fourth Proportional to 13,339.86, 19,967.85 and 9,155.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,339.86 : 19,967.85 = 9,155.40 : x
2. Step 2: Convert to fraction form
   13,339.86/19,967.85 = 9,155.40/x
3. Step 3: Cross multiply
   13,339.86x = 19,967.85 × 9,155.40
4. Step 4: Simplify right side
   13,339.86x = 182,813,653.89
5. Step 5: Solve for x
   x = 182,813,653.89/13,339.86
6. Step 6: Final answer
   x = 13,704.32