Finding the Fourth Proportional to 105,719.20, 145,899.24 and 69,846.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,719.20 : 145,899.24 = 69,846.28 : x
2. Step 2: Convert to fraction form
   105,719.20/145,899.24 = 69,846.28/x
3. Step 3: Cross multiply
   105,719.20x = 145,899.24 × 69,846.28
4. Step 4: Simplify right side
   105,719.20x = 10,190,519,168.83
5. Step 5: Solve for x
   x = 10,190,519,168.83/105,719.20
6. Step 6: Final answer
   x = 96,392.32