Finding the Fourth Proportional to 9,180.69, 12,670.35 and 5,404.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,180.69 : 12,670.35 = 5,404.78 : x
2. Step 2: Convert to fraction form
   9,180.69/12,670.35 = 5,404.78/x
3. Step 3: Cross multiply
   9,180.69x = 12,670.35 × 5,404.78
4. Step 4: Simplify right side
   9,180.69x = 68,480,393.77
5. Step 5: Solve for x
   x = 68,480,393.77/9,180.69
6. Step 6: Final answer
   x = 7,459.18