Finding the Fourth Proportional to 13,899.97, 19,181.72 and 7,931.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,899.97 : 19,181.72 = 7,931.48 : x
2. Step 2: Convert to fraction form
   13,899.97/19,181.72 = 7,931.48/x
3. Step 3: Cross multiply
   13,899.97x = 19,181.72 × 7,931.48
4. Step 4: Simplify right side
   13,899.97x = 152,139,388.89
5. Step 5: Solve for x
   x = 152,139,388.89/13,899.97
6. Step 6: Final answer
   x = 10,945.31