Finding the Fourth Proportional to 42,817.91, 64,233 and 13,238.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,817.91 : 64,233 = 13,238.04 : x
2. Step 2: Convert to fraction form
   42,817.91/64,233 = 13,238.04/x
3. Step 3: Cross multiply
   42,817.91x = 64,233 × 13,238.04
4. Step 4: Simplify right side
   42,817.91x = 850,319,023.32
5. Step 5: Solve for x
   x = 850,319,023.32/42,817.91
6. Step 6: Final answer
   x = 19,858.96