Finding the Fourth Proportional to 42,835.19, 64,258.92 and 13,255.34

Step by Step Solution

1. Step 1: Write the proportion equation
   42,835.19 : 64,258.92 = 13,255.34 : x
2. Step 2: Convert to fraction form
   42,835.19/64,258.92 = 13,255.34/x
3. Step 3: Cross multiply
   42,835.19x = 64,258.92 × 13,255.34
4. Step 4: Simplify right side
   42,835.19x = 851,773,511.34
5. Step 5: Solve for x
   x = 851,773,511.34/42,835.19
6. Step 6: Final answer
   x = 19,884.90