Finding the Fourth Proportional to 13,187.88, 18,196.32 and 7,881.84

Step by Step Solution

1. Step 1: Write the proportion equation
   13,187.88 : 18,196.32 = 7,881.84 : x
2. Step 2: Convert to fraction form
   13,187.88/18,196.32 = 7,881.84/x
3. Step 3: Cross multiply
   13,187.88x = 18,196.32 × 7,881.84
4. Step 4: Simplify right side
   13,187.88x = 143,420,482.83
5. Step 5: Solve for x
   x = 143,420,482.83/13,187.88
6. Step 6: Final answer
   x = 10,875.17