Finding the Fourth Proportional to 42,926.42, 64,389.32 and 13,344.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,926.42 : 64,389.32 = 13,344.20 : x
2. Step 2: Convert to fraction form
   42,926.42/64,389.32 = 13,344.20/x
3. Step 3: Cross multiply
   42,926.42x = 64,389.32 × 13,344.20
4. Step 4: Simplify right side
   42,926.42x = 859,223,897.22
5. Step 5: Solve for x
   x = 859,223,897.22/42,926.42
6. Step 6: Final answer
   x = 20,016.20