Finding the Fourth Proportional to 105,390.90, 145,499.62 and 69,684.48

Step by Step Solution

1. Step 1: Write the proportion equation
   105,390.90 : 145,499.62 = 69,684.48 : x
2. Step 2: Convert to fraction form
   105,390.90/145,499.62 = 69,684.48/x
3. Step 3: Cross multiply
   105,390.90x = 145,499.62 × 69,684.48
4. Step 4: Simplify right side
   105,390.90x = 10,139,065,359.90
5. Step 5: Solve for x
   x = 10,139,065,359.90/105,390.90
6. Step 6: Final answer
   x = 96,204.37