Finding the Fourth Proportional to 19,588.72, 29,388.52 and 7,899.20

Step by Step Solution

1. Step 1: Write the proportion equation
   19,588.72 : 29,388.52 = 7,899.20 : x
2. Step 2: Convert to fraction form
   19,588.72/29,388.52 = 7,899.20/x
3. Step 3: Cross multiply
   19,588.72x = 29,388.52 × 7,899.20
4. Step 4: Simplify right side
   19,588.72x = 232,145,797.18
5. Step 5: Solve for x
   x = 232,145,797.18/19,588.72
6. Step 6: Final answer
   x = 11,850.99