Finding the Fourth Proportional to 91,917.06, 137,992.25 and 78,153.54

Step by Step Solution

1. Step 1: Write the proportion equation
   91,917.06 : 137,992.25 = 78,153.54 : x
2. Step 2: Convert to fraction form
   91,917.06/137,992.25 = 78,153.54/x
3. Step 3: Cross multiply
   91,917.06x = 137,992.25 × 78,153.54
4. Step 4: Simplify right side
   91,917.06x = 10,784,582,830.07
5. Step 5: Solve for x
   x = 10,784,582,830.07/91,917.06
6. Step 6: Final answer
   x = 117,329.50