Finding the Fourth Proportional to 12,920.39, 17,832.09 and 7,887.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.39 : 17,832.09 = 7,887.54 : x
2. Step 2: Convert to fraction form
   12,920.39/17,832.09 = 7,887.54/x
3. Step 3: Cross multiply
   12,920.39x = 17,832.09 × 7,887.54
4. Step 4: Simplify right side
   12,920.39x = 140,651,419.61
5. Step 5: Solve for x
   x = 140,651,419.61/12,920.39
6. Step 6: Final answer
   x = 10,886.00