Finding the Fourth Proportional to 109,412.10, 164,118.15 and 91,916.10

Step by Step Solution

1. Step 1: Write the proportion equation
   109,412.10 : 164,118.15 = 91,916.10 : x
2. Step 2: Convert to fraction form
   109,412.10/164,118.15 = 91,916.10/x
3. Step 3: Cross multiply
   109,412.10x = 164,118.15 × 91,916.10
4. Step 4: Simplify right side
   109,412.10x = 15,085,100,287.22
5. Step 5: Solve for x
   x = 15,085,100,287.22/109,412.10
6. Step 6: Final answer
   x = 137,874.15