Finding the Fourth Proportional to 105,269.18, 145,269.72 and 57,521.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,269.18 : 145,269.72 = 57,521.50 : x
2. Step 2: Convert to fraction form
   105,269.18/145,269.72 = 57,521.50/x
3. Step 3: Cross multiply
   105,269.18x = 145,269.72 × 57,521.50
4. Step 4: Simplify right side
   105,269.18x = 8,356,131,835.81
5. Step 5: Solve for x
   x = 8,356,131,835.81/105,269.18
6. Step 6: Final answer
   x = 79,378.71