Finding the Fourth Proportional to 9,158.32, 12,636.28 and 5,178.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.32 : 12,636.28 = 5,178.88 : x
2. Step 2: Convert to fraction form
   9,158.32/12,636.28 = 5,178.88/x
3. Step 3: Cross multiply
   9,158.32x = 12,636.28 × 5,178.88
4. Step 4: Simplify right side
   9,158.32x = 65,441,777.77
5. Step 5: Solve for x
   x = 65,441,777.77/9,158.32
6. Step 6: Final answer
   x = 7,145.61