Finding the Fourth Proportional to 28,435.48, 42,568.98 and 21,073

Step by Step Solution

1. Step 1: Write the proportion equation
   28,435.48 : 42,568.98 = 21,073 : x
2. Step 2: Convert to fraction form
   28,435.48/42,568.98 = 21,073/x
3. Step 3: Cross multiply
   28,435.48x = 42,568.98 × 21,073
4. Step 4: Simplify right side
   28,435.48x = 897,056,115.54
5. Step 5: Solve for x
   x = 897,056,115.54/28,435.48
6. Step 6: Final answer
   x = 31,547.07