Finding the Fourth Proportional to 86,142.72, 129,237.12 and 30,741.76

Step by Step Solution

1. Step 1: Write the proportion equation
   86,142.72 : 129,237.12 = 30,741.76 : x
2. Step 2: Convert to fraction form
   86,142.72/129,237.12 = 30,741.76/x
3. Step 3: Cross multiply
   86,142.72x = 129,237.12 × 30,741.76
4. Step 4: Simplify right side
   86,142.72x = 3,972,976,526.13
5. Step 5: Solve for x
   x = 3,972,976,526.13/86,142.72
6. Step 6: Final answer
   x = 46,120.86