Finding the Fourth Proportional to 99,724.43, 149,585.50 and 28,648.81

Step by Step Solution

1. Step 1: Write the proportion equation
   99,724.43 : 149,585.50 = 28,648.81 : x
2. Step 2: Convert to fraction form
   99,724.43/149,585.50 = 28,648.81/x
3. Step 3: Cross multiply
   99,724.43x = 149,585.50 × 28,648.81
4. Step 4: Simplify right side
   99,724.43x = 4,285,446,568.26
5. Step 5: Solve for x
   x = 4,285,446,568.26/99,724.43
6. Step 6: Final answer
   x = 42,972.89