Finding the Fourth Proportional to 12,899.86, 19,343.31 and 5,979.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.86 : 19,343.31 = 5,979.22 : x
2. Step 2: Convert to fraction form
   12,899.86/19,343.31 = 5,979.22/x
3. Step 3: Cross multiply
   12,899.86x = 19,343.31 × 5,979.22
4. Step 4: Simplify right side
   12,899.86x = 115,657,906.02
5. Step 5: Solve for x
   x = 115,657,906.02/12,899.86
6. Step 6: Final answer
   x = 8,965.83