Finding the Fourth Proportional to 105,409.74, 145,499.31 and 69,631.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,409.74 : 145,499.31 = 69,631.50 : x
2. Step 2: Convert to fraction form
   105,409.74/145,499.31 = 69,631.50/x
3. Step 3: Cross multiply
   105,409.74x = 145,499.31 × 69,631.50
4. Step 4: Simplify right side
   105,409.74x = 10,131,335,204.27
5. Step 5: Solve for x
   x = 10,131,335,204.27/105,409.74
6. Step 6: Final answer
   x = 96,113.84