Finding the Fourth Proportional to 72,145.82, 108,218.72 and 19,555.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72,145.82 : 108,218.72 = 19,555.31 : x
2. Step 2: Convert to fraction form
   72,145.82/108,218.72 = 19,555.31/x
3. Step 3: Cross multiply
   72,145.82x = 108,218.72 × 19,555.31
4. Step 4: Simplify right side
   72,145.82x = 2,116,249,978.53
5. Step 5: Solve for x
   x = 2,116,249,978.53/72,145.82
6. Step 6: Final answer
   x = 29,332.96