Finding the Fourth Proportional to 13,857.50, 20,773.56 and 5,085.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,857.50 : 20,773.56 = 5,085.74 : x
2. Step 2: Convert to fraction form
   13,857.50/20,773.56 = 5,085.74/x
3. Step 3: Cross multiply
   13,857.50x = 20,773.56 × 5,085.74
4. Step 4: Simplify right side
   13,857.50x = 105,648,925.03
5. Step 5: Solve for x
   x = 105,648,925.03/13,857.50
6. Step 6: Final answer
   x = 7,623.95