Finding the Fourth Proportional to 112,438.45, 155,186.72 and 72,203.05

Step by Step Solution

1. Step 1: Write the proportion equation
   112,438.45 : 155,186.72 = 72,203.05 : x
2. Step 2: Convert to fraction form
   112,438.45/155,186.72 = 72,203.05/x
3. Step 3: Cross multiply
   112,438.45x = 155,186.72 × 72,203.05
4. Step 4: Simplify right side
   112,438.45x = 11,204,954,503.50
5. Step 5: Solve for x
   x = 11,204,954,503.50/112,438.45
6. Step 6: Final answer
   x = 99,654.12