Finding the Fourth Proportional to 9,381.86, 14,061.86 and 5,478.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,381.86 : 14,061.86 = 5,478.07 : x
2. Step 2: Convert to fraction form
   9,381.86/14,061.86 = 5,478.07/x
3. Step 3: Cross multiply
   9,381.86x = 14,061.86 × 5,478.07
4. Step 4: Simplify right side
   9,381.86x = 77,031,811.41
5. Step 5: Solve for x
   x = 77,031,811.41/9,381.86
6. Step 6: Final answer
   x = 8,210.72