Finding the Fourth Proportional to 56,789.10, 78,365.88 and 31,290.54

Step by Step Solution

1. Step 1: Write the proportion equation
   56,789.10 : 78,365.88 = 31,290.54 : x
2. Step 2: Convert to fraction form
   56,789.10/78,365.88 = 31,290.54/x
3. Step 3: Cross multiply
   56,789.10x = 78,365.88 × 31,290.54
4. Step 4: Simplify right side
   56,789.10x = 2,452,110,702.78
5. Step 5: Solve for x
   x = 2,452,110,702.78/56,789.10
6. Step 6: Final answer
   x = 43,179.25