Finding the Fourth Proportional to 103,112.24, 142,145.78 and 72,391.81

Step by Step Solution

1. Step 1: Write the proportion equation
   103,112.24 : 142,145.78 = 72,391.81 : x
2. Step 2: Convert to fraction form
   103,112.24/142,145.78 = 72,391.81/x
3. Step 3: Cross multiply
   103,112.24x = 142,145.78 × 72,391.81
4. Step 4: Simplify right side
   103,112.24x = 10,290,189,587.33
5. Step 5: Solve for x
   x = 10,290,189,587.33/103,112.24
6. Step 6: Final answer
   x = 99,796.01