Finding the Fourth Proportional to 13,899.17, 19,178.16 and 7,930.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,899.17 : 19,178.16 = 7,930.69 : x
2. Step 2: Convert to fraction form
   13,899.17/19,178.16 = 7,930.69/x
3. Step 3: Cross multiply
   13,899.17x = 19,178.16 × 7,930.69
4. Step 4: Simplify right side
   13,899.17x = 152,095,945.84
5. Step 5: Solve for x
   x = 152,095,945.84/13,899.17
6. Step 6: Final answer
   x = 10,942.81