Finding the Fourth Proportional to 9,178.95, 12,653.01 and 7,186.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,178.95 : 12,653.01 = 7,186.05 : x
2. Step 2: Convert to fraction form
   9,178.95/12,653.01 = 7,186.05/x
3. Step 3: Cross multiply
   9,178.95x = 12,653.01 × 7,186.05
4. Step 4: Simplify right side
   9,178.95x = 90,925,162.51
5. Step 5: Solve for x
   x = 90,925,162.51/9,178.95
6. Step 6: Final answer
   x = 9,905.83