Finding the Fourth Proportional to 105,688.17, 145,895.31 and 63,238.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,688.17 : 145,895.31 = 63,238.50 : x
2. Step 2: Convert to fraction form
   105,688.17/145,895.31 = 63,238.50/x
3. Step 3: Cross multiply
   105,688.17x = 145,895.31 × 63,238.50
4. Step 4: Simplify right side
   105,688.17x = 9,226,200,561.44
5. Step 5: Solve for x
   x = 9,226,200,561.44/105,688.17
6. Step 6: Final answer
   x = 87,296.44