Finding the Fourth Proportional to 117,981.78, 162,810.25 and 72,118.20

Step by Step Solution

1. Step 1: Write the proportion equation
   117,981.78 : 162,810.25 = 72,118.20 : x
2. Step 2: Convert to fraction form
   117,981.78/162,810.25 = 72,118.20/x
3. Step 3: Cross multiply
   117,981.78x = 162,810.25 × 72,118.20
4. Step 4: Simplify right side
   117,981.78x = 11,741,582,817.69
5. Step 5: Solve for x
   x = 11,741,582,817.69/117,981.78
6. Step 6: Final answer
   x = 99,520.31