Finding the Fourth Proportional to 42,818.58, 64,204.29 and 13,228.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,818.58 : 64,204.29 = 13,228.20 : x
2. Step 2: Convert to fraction form
   42,818.58/64,204.29 = 13,228.20/x
3. Step 3: Cross multiply
   42,818.58x = 64,204.29 × 13,228.20
4. Step 4: Simplify right side
   42,818.58x = 849,307,188.98
5. Step 5: Solve for x
   x = 849,307,188.98/42,818.58
6. Step 6: Final answer
   x = 19,835.02