Finding the Fourth Proportional to 109,940.78, 164,943.99 and 77,981.42

Step by Step Solution

1. Step 1: Write the proportion equation
   109,940.78 : 164,943.99 = 77,981.42 : x
2. Step 2: Convert to fraction form
   109,940.78/164,943.99 = 77,981.42/x
3. Step 3: Cross multiply
   109,940.78x = 164,943.99 × 77,981.42
4. Step 4: Simplify right side
   109,940.78x = 12,862,566,560.67
5. Step 5: Solve for x
   x = 12,862,566,560.67/109,940.78
6. Step 6: Final answer
   x = 116,995.41