Finding the Fourth Proportional to 42,817.98, 64,233.12 and 13,238.13

Step by Step Solution

1. Step 1: Write the proportion equation
   42,817.98 : 64,233.12 = 13,238.13 : x
2. Step 2: Convert to fraction form
   42,817.98/64,233.12 = 13,238.13/x
3. Step 3: Cross multiply
   42,817.98x = 64,233.12 × 13,238.13
4. Step 4: Simplify right side
   42,817.98x = 850,326,683.38
5. Step 5: Solve for x
   x = 850,326,683.38/42,817.98
6. Step 6: Final answer
   x = 19,859.10