Finding the Fourth Proportional to 13,404.93, 18,521.82 and 12,931.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,404.93 : 18,521.82 = 12,931.89 : x
2. Step 2: Convert to fraction form
   13,404.93/18,521.82 = 12,931.89/x
3. Step 3: Cross multiply
   13,404.93x = 18,521.82 × 12,931.89
4. Step 4: Simplify right side
   13,404.93x = 239,522,138.84
5. Step 5: Solve for x
   x = 239,522,138.84/13,404.93
6. Step 6: Final answer
   x = 17,868.21