Finding the Fourth Proportional to 42,996.32, 64,502.06 and 13,406.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42,996.32 : 64,502.06 = 13,406.79 : x
2. Step 2: Convert to fraction form
   42,996.32/64,502.06 = 13,406.79/x
3. Step 3: Cross multiply
   42,996.32x = 64,502.06 × 13,406.79
4. Step 4: Simplify right side
   42,996.32x = 864,765,505.95
5. Step 5: Solve for x
   x = 864,765,505.95/42,996.32
6. Step 6: Final answer
   x = 20,112.55