Finding the Fourth Proportional to 42,885.67, 64,367.73 and 21,840.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,885.67 : 64,367.73 = 21,840.25 : x
2. Step 2: Convert to fraction form
   42,885.67/64,367.73 = 21,840.25/x
3. Step 3: Cross multiply
   42,885.67x = 64,367.73 × 21,840.25
4. Step 4: Simplify right side
   42,885.67x = 1,405,807,315.13
5. Step 5: Solve for x
   x = 1,405,807,315.13/42,885.67
6. Step 6: Final answer
   x = 32,780.35