Finding the Fourth Proportional to 149,139.72, 205,806.54 and 81,156.96

Step by Step Solution

1. Step 1: Write the proportion equation
   149,139.72 : 205,806.54 = 81,156.96 : x
2. Step 2: Convert to fraction form
   149,139.72/205,806.54 = 81,156.96/x
3. Step 3: Cross multiply
   149,139.72x = 205,806.54 × 81,156.96
4. Step 4: Simplify right side
   149,139.72x = 16,702,633,134.52
5. Step 5: Solve for x
   x = 16,702,633,134.52/149,139.72
6. Step 6: Final answer
   x = 111,993.19