Finding the Fourth Proportional to 13,156.82, 18,156.67 and 7,188.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,156.82 : 18,156.67 = 7,188.86 : x
2. Step 2: Convert to fraction form
   13,156.82/18,156.67 = 7,188.86/x
3. Step 3: Cross multiply
   13,156.82x = 18,156.67 × 7,188.86
4. Step 4: Simplify right side
   13,156.82x = 130,525,667.91
5. Step 5: Solve for x
   x = 130,525,667.91/13,156.82
6. Step 6: Final answer
   x = 9,920.76