Finding the Fourth Proportional to 112,459.34, 155,132.46 and 72,128.22

Step by Step Solution

1. Step 1: Write the proportion equation
   112,459.34 : 155,132.46 = 72,128.22 : x
2. Step 2: Convert to fraction form
   112,459.34/155,132.46 = 72,128.22/x
3. Step 3: Cross multiply
   112,459.34x = 155,132.46 × 72,128.22
4. Step 4: Simplify right side
   112,459.34x = 11,189,428,204.02
5. Step 5: Solve for x
   x = 11,189,428,204.02/112,459.34
6. Step 6: Final answer
   x = 99,497.55