Finding the Fourth Proportional to 56,140.04, 77,472.78 and 30,989

Step by Step Solution

1. Step 1: Write the proportion equation
   56,140.04 : 77,472.78 = 30,989 : x
2. Step 2: Convert to fraction form
   56,140.04/77,472.78 = 30,989/x
3. Step 3: Cross multiply
   56,140.04x = 77,472.78 × 30,989
4. Step 4: Simplify right side
   56,140.04x = 2,400,803,979.42
5. Step 5: Solve for x
   x = 2,400,803,979.42/56,140.04
6. Step 6: Final answer
   x = 42,764.56