Finding the Fourth Proportional to 74,098.72, 111,153.72 and 31,979.80

Step by Step Solution

1. Step 1: Write the proportion equation
   74,098.72 : 111,153.72 = 31,979.80 : x
2. Step 2: Convert to fraction form
   74,098.72/111,153.72 = 31,979.80/x
3. Step 3: Cross multiply
   74,098.72x = 111,153.72 × 31,979.80
4. Step 4: Simplify right side
   74,098.72x = 3,554,673,734.86
5. Step 5: Solve for x
   x = 3,554,673,734.86/74,098.72
6. Step 6: Final answer
   x = 47,972.13