Finding the Fourth Proportional to 105,391.90, 145,501 and 69,685.48

Step by Step Solution

1. Step 1: Write the proportion equation
   105,391.90 : 145,501 = 69,685.48 : x
2. Step 2: Convert to fraction form
   105,391.90/145,501 = 69,685.48/x
3. Step 3: Cross multiply
   105,391.90x = 145,501 × 69,685.48
4. Step 4: Simplify right side
   105,391.90x = 10,139,307,025.48
5. Step 5: Solve for x
   x = 10,139,307,025.48/105,391.90
6. Step 6: Final answer
   x = 96,205.75