Finding the Fourth Proportional to 56,472.24, 77,931.15 and 30,978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   56,472.24 : 77,931.15 = 30,978.09 : x
2. Step 2: Convert to fraction form
   56,472.24/77,931.15 = 30,978.09/x
3. Step 3: Cross multiply
   56,472.24x = 77,931.15 × 30,978.09
4. Step 4: Simplify right side
   56,472.24x = 2,414,158,178.50
5. Step 5: Solve for x
   x = 2,414,158,178.50/56,472.24
6. Step 6: Final answer
   x = 42,749.47