Finding the Fourth Proportional to 13,490.82, 18,615.97 and 7,521.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,490.82 : 18,615.97 = 7,521.93 : x
2. Step 2: Convert to fraction form
   13,490.82/18,615.97 = 7,521.93/x
3. Step 3: Cross multiply
   13,490.82x = 18,615.97 × 7,521.93
4. Step 4: Simplify right side
   13,490.82x = 140,028,023.22
5. Step 5: Solve for x
   x = 140,028,023.22/13,490.82
6. Step 6: Final answer
   x = 10,379.50