Finding the Fourth Proportional to 112,518.05, 155,201.74 and 72,167.90

Step by Step Solution

1. Step 1: Write the proportion equation
   112,518.05 : 155,201.74 = 72,167.90 : x
2. Step 2: Convert to fraction form
   112,518.05/155,201.74 = 72,167.90/x
3. Step 3: Cross multiply
   112,518.05x = 155,201.74 × 72,167.90
4. Step 4: Simplify right side
   112,518.05x = 11,200,582,695.72
5. Step 5: Solve for x
   x = 11,200,582,695.72/112,518.05
6. Step 6: Final answer
   x = 99,544.77