Finding the Fourth Proportional to 13,323.12, 19,978.86 and 7,081.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,323.12 : 19,978.86 = 7,081.64 : x
2. Step 2: Convert to fraction form
   13,323.12/19,978.86 = 7,081.64/x
3. Step 3: Cross multiply
   13,323.12x = 19,978.86 × 7,081.64
4. Step 4: Simplify right side
   13,323.12x = 141,483,094.13
5. Step 5: Solve for x
   x = 141,483,094.13/13,323.12
6. Step 6: Final answer
   x = 10,619.37