Finding the Fourth Proportional to 56,128.04, 77,456.20 and 30,977

Step by Step Solution

1. Step 1: Write the proportion equation
   56,128.04 : 77,456.20 = 30,977 : x
2. Step 2: Convert to fraction form
   56,128.04/77,456.20 = 30,977/x
3. Step 3: Cross multiply
   56,128.04x = 77,456.20 × 30,977
4. Step 4: Simplify right side
   56,128.04x = 2,399,360,707.40
5. Step 5: Solve for x
   x = 2,399,360,707.40/56,128.04
6. Step 6: Final answer
   x = 42,747.99