Finding the Fourth Proportional to 109,661.43, 164,117.86 and 91,912.12

Step by Step Solution

1. Step 1: Write the proportion equation
   109,661.43 : 164,117.86 = 91,912.12 : x
2. Step 2: Convert to fraction form
   109,661.43/164,117.86 = 91,912.12/x
3. Step 3: Cross multiply
   109,661.43x = 164,117.86 × 91,912.12
4. Step 4: Simplify right side
   109,661.43x = 15,084,420,442.46
5. Step 5: Solve for x
   x = 15,084,420,442.46/109,661.43
6. Step 6: Final answer
   x = 137,554.48