Finding the Fourth Proportional to 56,609.35, 78,121.61 and 31,118.49

Step by Step Solution

1. Step 1: Write the proportion equation
   56,609.35 : 78,121.61 = 31,118.49 : x
2. Step 2: Convert to fraction form
   56,609.35/78,121.61 = 31,118.49/x
3. Step 3: Cross multiply
   56,609.35x = 78,121.61 × 31,118.49
4. Step 4: Simplify right side
   56,609.35x = 2,431,026,539.57
5. Step 5: Solve for x
   x = 2,431,026,539.57/56,609.35
6. Step 6: Final answer
   x = 42,943.90