Finding the Fourth Proportional to 112,405.50, 155,014.15 and 72,131.94

Step by Step Solution

1. Step 1: Write the proportion equation
   112,405.50 : 155,014.15 = 72,131.94 : x
2. Step 2: Convert to fraction form
   112,405.50/155,014.15 = 72,131.94/x
3. Step 3: Cross multiply
   112,405.50x = 155,014.15 × 72,131.94
4. Step 4: Simplify right side
   112,405.50x = 11,181,471,754.49
5. Step 5: Solve for x
   x = 11,181,471,754.49/112,405.50
6. Step 6: Final answer
   x = 99,474.42