Finding the Fourth Proportional to 9,178.90, 12,665.07 and 5,402.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,178.90 : 12,665.07 = 5,402.23 : x
2. Step 2: Convert to fraction form
   9,178.90/12,665.07 = 5,402.23/x
3. Step 3: Cross multiply
   9,178.90x = 12,665.07 × 5,402.23
4. Step 4: Simplify right side
   9,178.90x = 68,419,530.77
5. Step 5: Solve for x
   x = 68,419,530.77/9,178.90
6. Step 6: Final answer
   x = 7,454.00