Finding the Fourth Proportional to 10,890.63, 16,314.54 and 7,181.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.63 : 16,314.54 = 7,181.55 : x
2. Step 2: Convert to fraction form
   10,890.63/16,314.54 = 7,181.55/x
3. Step 3: Cross multiply
   10,890.63x = 16,314.54 × 7,181.55
4. Step 4: Simplify right side
   10,890.63x = 117,163,684.74
5. Step 5: Solve for x
   x = 117,163,684.74/10,890.63
6. Step 6: Final answer
   x = 10,758.21