Finding the Fourth Proportional to 31,159.56, 42,990.87 and 18,413.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,159.56 : 42,990.87 = 18,413.91 : x
2. Step 2: Convert to fraction form
   31,159.56/42,990.87 = 18,413.91/x
3. Step 3: Cross multiply
   31,159.56x = 42,990.87 × 18,413.91
4. Step 4: Simplify right side
   31,159.56x = 791,630,011.00
5. Step 5: Solve for x
   x = 791,630,011.00/31,159.56
6. Step 6: Final answer
   x = 25,405.69