Finding the Fourth Proportional to 13,156.29, 18,155.94 and 7,188.33

Step by Step Solution

1. Step 1: Write the proportion equation
   13,156.29 : 18,155.94 = 7,188.33 : x
2. Step 2: Convert to fraction form
   13,156.29/18,155.94 = 7,188.33/x
3. Step 3: Cross multiply
   13,156.29x = 18,155.94 × 7,188.33
4. Step 4: Simplify right side
   13,156.29x = 130,510,779.43
5. Step 5: Solve for x
   x = 130,510,779.43/13,156.29
6. Step 6: Final answer
   x = 9,920.03