Finding the Fourth Proportional to 105,389.90, 145,498.24 and 69,683.48

Step by Step Solution

1. Step 1: Write the proportion equation
   105,389.90 : 145,498.24 = 69,683.48 : x
2. Step 2: Convert to fraction form
   105,389.90/145,498.24 = 69,683.48/x
3. Step 3: Cross multiply
   105,389.90x = 145,498.24 × 69,683.48
4. Step 4: Simplify right side
   105,389.90x = 10,138,823,697.08
5. Step 5: Solve for x
   x = 10,138,823,697.08/105,389.90
6. Step 6: Final answer
   x = 96,202.99