Finding the Fourth Proportional to 12,884.91, 17,781.83 and 7,219.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,884.91 : 17,781.83 = 7,219.31 : x
2. Step 2: Convert to fraction form
   12,884.91/17,781.83 = 7,219.31/x
3. Step 3: Cross multiply
   12,884.91x = 17,781.83 × 7,219.31
4. Step 4: Simplify right side
   12,884.91x = 128,372,545.23
5. Step 5: Solve for x
   x = 128,372,545.23/12,884.91
6. Step 6: Final answer
   x = 9,963.02