Finding the Fourth Proportional to 38,085.53, 57,116.45 and 12,780.12

Step by Step Solution

1. Step 1: Write the proportion equation
   38,085.53 : 57,116.45 = 12,780.12 : x
2. Step 2: Convert to fraction form
   38,085.53/57,116.45 = 12,780.12/x
3. Step 3: Cross multiply
   38,085.53x = 57,116.45 × 12,780.12
4. Step 4: Simplify right side
   38,085.53x = 729,955,116.92
5. Step 5: Solve for x
   x = 729,955,116.92/38,085.53
6. Step 6: Final answer
   x = 19,166.20