Finding the Fourth Proportional to 56,978.05, 78,629.87 and 31,485.13

Step by Step Solution

1. Step 1: Write the proportion equation
   56,978.05 : 78,629.87 = 31,485.13 : x
2. Step 2: Convert to fraction form
   56,978.05/78,629.87 = 31,485.13/x
3. Step 3: Cross multiply
   56,978.05x = 78,629.87 × 31,485.13
4. Step 4: Simplify right side
   56,978.05x = 2,475,671,678.83
5. Step 5: Solve for x
   x = 2,475,671,678.83/56,978.05
6. Step 6: Final answer
   x = 43,449.57