Finding the Fourth Proportional to 105,280.84, 145,289.46 and 57,536.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,280.84 : 145,289.46 = 57,536.20 : x
2. Step 2: Convert to fraction form
   105,280.84/145,289.46 = 57,536.20/x
3. Step 3: Cross multiply
   105,280.84x = 145,289.46 × 57,536.20
4. Step 4: Simplify right side
   105,280.84x = 8,359,403,428.45
5. Step 5: Solve for x
   x = 8,359,403,428.45/105,280.84
6. Step 6: Final answer
   x = 79,400.99