Finding the Fourth Proportional to 56,130.43, 77,454.48 and 30,978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   56,130.43 : 77,454.48 = 30,978.31 : x
2. Step 2: Convert to fraction form
   56,130.43/77,454.48 = 30,978.31/x
3. Step 3: Cross multiply
   56,130.43x = 77,454.48 × 30,978.31
4. Step 4: Simplify right side
   56,130.43x = 2,399,408,892.33
5. Step 5: Solve for x
   x = 2,399,408,892.33/56,130.43
6. Step 6: Final answer
   x = 42,747.02