Finding the Fourth Proportional to 28,258.50, 42,395.31 and 9,790.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,258.50 : 42,395.31 = 9,790.50 : x
2. Step 2: Convert to fraction form
   28,258.50/42,395.31 = 9,790.50/x
3. Step 3: Cross multiply
   28,258.50x = 42,395.31 × 9,790.50
4. Step 4: Simplify right side
   28,258.50x = 415,071,282.56
5. Step 5: Solve for x
   x = 415,071,282.56/28,258.50
6. Step 6: Final answer
   x = 14,688.37