Finding the Fourth Proportional to 13,761.78, 18,991.47 and 7,474.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,761.78 : 18,991.47 = 7,474.15 : x
2. Step 2: Convert to fraction form
   13,761.78/18,991.47 = 7,474.15/x
3. Step 3: Cross multiply
   13,761.78x = 18,991.47 × 7,474.15
4. Step 4: Simplify right side
   13,761.78x = 141,945,095.50
5. Step 5: Solve for x
   x = 141,945,095.50/13,761.78
6. Step 6: Final answer
   x = 10,314.44