Finding the Fourth Proportional to 12,919.56, 17,830.38 and 7,886.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,919.56 : 17,830.38 = 7,886.76 : x
2. Step 2: Convert to fraction form
   12,919.56/17,830.38 = 7,886.76/x
3. Step 3: Cross multiply
   12,919.56x = 17,830.38 × 7,886.76
4. Step 4: Simplify right side
   12,919.56x = 140,623,927.77
5. Step 5: Solve for x
   x = 140,623,927.77/12,919.56
6. Step 6: Final answer
   x = 10,884.58