Finding the Fourth Proportional to 145,111.69, 200,243.15 and 81,437.19

Step by Step Solution

1. Step 1: Write the proportion equation
   145,111.69 : 200,243.15 = 81,437.19 : x
2. Step 2: Convert to fraction form
   145,111.69/200,243.15 = 81,437.19/x
3. Step 3: Cross multiply
   145,111.69x = 200,243.15 × 81,437.19
4. Step 4: Simplify right side
   145,111.69x = 16,307,238,952.14
5. Step 5: Solve for x
   x = 16,307,238,952.14/145,111.69
6. Step 6: Final answer
   x = 112,377.15