Finding the Fourth Proportional to 56,129.04, 77,458.05 and 30,978.54

Step by Step Solution

1. Step 1: Write the proportion equation
   56,129.04 : 77,458.05 = 30,978.54 : x
2. Step 2: Convert to fraction form
   56,129.04/77,458.05 = 30,978.54/x
3. Step 3: Cross multiply
   56,129.04x = 77,458.05 × 30,978.54
4. Step 4: Simplify right side
   56,129.04x = 2,399,537,300.25
5. Step 5: Solve for x
   x = 2,399,537,300.25/56,129.04
6. Step 6: Final answer
   x = 42,750.37