Finding the Fourth Proportional to 56,605.85, 78,116.78 and 31,115.00

Step by Step Solution

1. Step 1: Write the proportion equation
   56,605.85 : 78,116.78 = 31,115.00 : x
2. Step 2: Convert to fraction form
   56,605.85/78,116.78 = 31,115.00/x
3. Step 3: Cross multiply
   56,605.85x = 78,116.78 × 31,115.00
4. Step 4: Simplify right side
   56,605.85x = 2,430,603,063.54
5. Step 5: Solve for x
   x = 2,430,603,063.54/56,605.85
6. Step 6: Final answer
   x = 42,939.08