Finding the Fourth Proportional to 13,699.57, 18,905.43 and 7,411.95

Step by Step Solution

1. Step 1: Write the proportion equation
   13,699.57 : 18,905.43 = 7,411.95 : x
2. Step 2: Convert to fraction form
   13,699.57/18,905.43 = 7,411.95/x
3. Step 3: Cross multiply
   13,699.57x = 18,905.43 × 7,411.95
4. Step 4: Simplify right side
   13,699.57x = 140,126,101.89
5. Step 5: Solve for x
   x = 140,126,101.89/13,699.57
6. Step 6: Final answer
   x = 10,228.50