Finding the Fourth Proportional to 42,985.58, 64,448.96 and 21,884.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42,985.58 : 64,448.96 = 21,884.79 : x
2. Step 2: Convert to fraction form
   42,985.58/64,448.96 = 21,884.79/x
3. Step 3: Cross multiply
   42,985.58x = 64,448.96 × 21,884.79
4. Step 4: Simplify right side
   42,985.58x = 1,410,451,955.32
5. Step 5: Solve for x
   x = 1,410,451,955.32/42,985.58
6. Step 6: Final answer
   x = 32,812.21