Finding the Fourth Proportional to 49,570.79, 74,365.71 and 19,991.61

Step by Step Solution

1. Step 1: Write the proportion equation
   49,570.79 : 74,365.71 = 19,991.61 : x
2. Step 2: Convert to fraction form
   49,570.79/74,365.71 = 19,991.61/x
3. Step 3: Cross multiply
   49,570.79x = 74,365.71 × 19,991.61
4. Step 4: Simplify right side
   49,570.79x = 1,486,690,271.69
5. Step 5: Solve for x
   x = 1,486,690,271.69/49,570.79
6. Step 6: Final answer
   x = 29,991.26