Finding the Fourth Proportional to 91,974.56, 138,136.78 and 57,157.52

Step by Step Solution

1. Step 1: Write the proportion equation
   91,974.56 : 138,136.78 = 57,157.52 : x
2. Step 2: Convert to fraction form
   91,974.56/138,136.78 = 57,157.52/x
3. Step 3: Cross multiply
   91,974.56x = 138,136.78 × 57,157.52
4. Step 4: Simplify right side
   91,974.56x = 7,895,555,765.59
5. Step 5: Solve for x
   x = 7,895,555,765.59/91,974.56
6. Step 6: Final answer
   x = 85,845.00