Finding the Fourth Proportional to 57,101.72, 85,617.89 and 28,605.53

Step by Step Solution

1. Step 1: Write the proportion equation
   57,101.72 : 85,617.89 = 28,605.53 : x
2. Step 2: Convert to fraction form
   57,101.72/85,617.89 = 28,605.53/x
3. Step 3: Cross multiply
   57,101.72x = 85,617.89 × 28,605.53
4. Step 4: Simplify right side
   57,101.72x = 2,449,144,549.81
5. Step 5: Solve for x
   x = 2,449,144,549.81/57,101.72
6. Step 6: Final answer
   x = 42,890.91