Finding the Fourth Proportional to 161,448.10, 242,258.55 and 72,715.30

Step by Step Solution

1. Step 1: Write the proportion equation
   161,448.10 : 242,258.55 = 72,715.30 : x
2. Step 2: Convert to fraction form
   161,448.10/242,258.55 = 72,715.30/x
3. Step 3: Cross multiply
   161,448.10x = 242,258.55 × 72,715.30
4. Step 4: Simplify right side
   161,448.10x = 17,615,903,140.82
5. Step 5: Solve for x
   x = 17,615,903,140.82/161,448.10
6. Step 6: Final answer
   x = 109,111.86