Finding the Fourth Proportional to 105,300.72, 145,314.24 and 57,553.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,300.72 : 145,314.24 = 57,553.20 : x
2. Step 2: Convert to fraction form
   105,300.72/145,314.24 = 57,553.20/x
3. Step 3: Cross multiply
   105,300.72x = 145,314.24 × 57,553.20
4. Step 4: Simplify right side
   105,300.72x = 8,363,299,517.57
5. Step 5: Solve for x
   x = 8,363,299,517.57/105,300.72
6. Step 6: Final answer
   x = 79,423.00