Finding the Fourth Proportional to 13,690.37, 18,892.73 and 7,402.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,690.37 : 18,892.73 = 7,402.74 : x
2. Step 2: Convert to fraction form
   13,690.37/18,892.73 = 7,402.74/x
3. Step 3: Cross multiply
   13,690.37x = 18,892.73 × 7,402.74
4. Step 4: Simplify right side
   13,690.37x = 139,857,980.37
5. Step 5: Solve for x
   x = 139,857,980.37/13,690.37
6. Step 6: Final answer
   x = 10,215.79