Finding the Fourth Proportional to 56,130.68, 77,454.83 and 30,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   56,130.68 : 77,454.83 = 30,978.56 : x
2. Step 2: Convert to fraction form
   56,130.68/77,454.83 = 30,978.56/x
3. Step 3: Cross multiply
   56,130.68x = 77,454.83 × 30,978.56
4. Step 4: Simplify right side
   56,130.68x = 2,399,438,943.55
5. Step 5: Solve for x
   x = 2,399,438,943.55/56,130.68
6. Step 6: Final answer
   x = 42,747.37