Finding the Fourth Proportional to 15,443.37, 21,312.42 and 9,391.86

Step by Step Solution

1. Step 1: Write the proportion equation
   15,443.37 : 21,312.42 = 9,391.86 : x
2. Step 2: Convert to fraction form
   15,443.37/21,312.42 = 9,391.86/x
3. Step 3: Cross multiply
   15,443.37x = 21,312.42 × 9,391.86
4. Step 4: Simplify right side
   15,443.37x = 200,163,264.90
5. Step 5: Solve for x
   x = 200,163,264.90/15,443.37
6. Step 6: Final answer
   x = 12,961.11