Finding the Fourth Proportional to 56,142.96, 77,477.10 and 30,992.28

Step by Step Solution

1. Step 1: Write the proportion equation
   56,142.96 : 77,477.10 = 30,992.28 : x
2. Step 2: Convert to fraction form
   56,142.96/77,477.10 = 30,992.28/x
3. Step 3: Cross multiply
   56,142.96x = 77,477.10 × 30,992.28
4. Step 4: Simplify right side
   56,142.96x = 2,401,191,976.79
5. Step 5: Solve for x
   x = 2,401,191,976.79/56,142.96
6. Step 6: Final answer
   x = 42,769.24