Finding the Fourth Proportional to 105,284.86, 145,293.20 and 57,538.22

Step by Step Solution

1. Step 1: Write the proportion equation
   105,284.86 : 145,293.20 = 57,538.22 : x
2. Step 2: Convert to fraction form
   105,284.86/145,293.20 = 57,538.22/x
3. Step 3: Cross multiply
   105,284.86x = 145,293.20 × 57,538.22
4. Step 4: Simplify right side
   105,284.86x = 8,359,912,106.10
5. Step 5: Solve for x
   x = 8,359,912,106.10/105,284.86
6. Step 6: Final answer
   x = 79,402.79