Finding the Fourth Proportional to 261,969.50, 392,953.73 and 72,429.38

Step by Step Solution

1. Step 1: Write the proportion equation
   261,969.50 : 392,953.73 = 72,429.38 : x
2. Step 2: Convert to fraction form
   261,969.50/392,953.73 = 72,429.38/x
3. Step 3: Cross multiply
   261,969.50x = 392,953.73 × 72,429.38
4. Step 4: Simplify right side
   261,969.50x = 28,461,392,705.67
5. Step 5: Solve for x
   x = 28,461,392,705.67/261,969.50
6. Step 6: Final answer
   x = 108,643.92