Finding the Fourth Proportional to 105,472.76, 145,551.54 and 57,725.98

Step by Step Solution

1. Step 1: Write the proportion equation
   105,472.76 : 145,551.54 = 57,725.98 : x
2. Step 2: Convert to fraction form
   105,472.76/145,551.54 = 57,725.98/x
3. Step 3: Cross multiply
   105,472.76x = 145,551.54 × 57,725.98
4. Step 4: Simplify right side
   105,472.76x = 8,402,105,287.01
5. Step 5: Solve for x
   x = 8,402,105,287.01/105,472.76
6. Step 6: Final answer
   x = 79,661.38