Finding the Fourth Proportional to 21,178.04, 31,776.76 and 9,173.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,178.04 : 31,776.76 = 9,173.86 : x
2. Step 2: Convert to fraction form
   21,178.04/31,776.76 = 9,173.86/x
3. Step 3: Cross multiply
   21,178.04x = 31,776.76 × 9,173.86
4. Step 4: Simplify right side
   21,178.04x = 291,515,564.28
5. Step 5: Solve for x
   x = 291,515,564.28/21,178.04
6. Step 6: Final answer
   x = 13,764.99