Finding the Fourth Proportional to 105,809.22, 145,978.28 and 69,530.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,809.22 : 145,978.28 = 69,530.12 : x
2. Step 2: Convert to fraction form
   105,809.22/145,978.28 = 69,530.12/x
3. Step 3: Cross multiply
   105,809.22x = 145,978.28 × 69,530.12
4. Step 4: Simplify right side
   105,809.22x = 10,149,887,325.79
5. Step 5: Solve for x
   x = 10,149,887,325.79/105,809.22
6. Step 6: Final answer
   x = 95,926.30