Finding the Fourth Proportional to 191,111.68, 263,734.28 and 105,072.12

Step by Step Solution

1. Step 1: Write the proportion equation
   191,111.68 : 263,734.28 = 105,072.12 : x
2. Step 2: Convert to fraction form
   191,111.68/263,734.28 = 105,072.12/x
3. Step 3: Cross multiply
   191,111.68x = 263,734.28 × 105,072.12
4. Step 4: Simplify right side
   191,111.68x = 27,711,119,916.27
5. Step 5: Solve for x
   x = 27,711,119,916.27/191,111.68
6. Step 6: Final answer
   x = 144,999.61