Finding the Fourth Proportional to 111,837.69, 154,310.67 and 81,639.45

Step by Step Solution

1. Step 1: Write the proportion equation
   111,837.69 : 154,310.67 = 81,639.45 : x
2. Step 2: Convert to fraction form
   111,837.69/154,310.67 = 81,639.45/x
3. Step 3: Cross multiply
   111,837.69x = 154,310.67 × 81,639.45
4. Step 4: Simplify right side
   111,837.69x = 12,597,838,227.93
5. Step 5: Solve for x
   x = 12,597,838,227.93/111,837.69
6. Step 6: Final answer
   x = 112,643.94