Finding the Fourth Proportional to 9,781.02, 14,678.21 and 5,401.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,781.02 : 14,678.21 = 5,401.55 : x
2. Step 2: Convert to fraction form
   9,781.02/14,678.21 = 5,401.55/x
3. Step 3: Cross multiply
   9,781.02x = 14,678.21 × 5,401.55
4. Step 4: Simplify right side
   9,781.02x = 79,284,984.83
5. Step 5: Solve for x
   x = 79,284,984.83/9,781.02
6. Step 6: Final answer
   x = 8,106.00