Finding the Fourth Proportional to 13,005.83, 19,509.05 and 5,991.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,005.83 : 19,509.05 = 5,991.72 : x
2. Step 2: Convert to fraction form
   13,005.83/19,509.05 = 5,991.72/x
3. Step 3: Cross multiply
   13,005.83x = 19,509.05 × 5,991.72
4. Step 4: Simplify right side
   13,005.83x = 116,892,816.62
5. Step 5: Solve for x
   x = 116,892,816.62/13,005.83
6. Step 6: Final answer
   x = 8,987.72