Finding the Fourth Proportional to 117,338.81, 161,915.54 and 72,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   117,338.81 : 161,915.54 = 72,018.72 : x
2. Step 2: Convert to fraction form
   117,338.81/161,915.54 = 72,018.72/x
3. Step 3: Cross multiply
   117,338.81x = 161,915.54 × 72,018.72
4. Step 4: Simplify right side
   117,338.81x = 11,660,949,578.82
5. Step 5: Solve for x
   x = 11,660,949,578.82/117,338.81
6. Step 6: Final answer
   x = 99,378.46