Finding the Fourth Proportional to 42,758.18, 64,139.43 and 13,196.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42,758.18 : 64,139.43 = 13,196.24 : x
2. Step 2: Convert to fraction form
   42,758.18/64,139.43 = 13,196.24/x
3. Step 3: Cross multiply
   42,758.18x = 64,139.43 × 13,196.24
4. Step 4: Simplify right side
   42,758.18x = 846,399,311.74
5. Step 5: Solve for x
   x = 846,399,311.74/42,758.18
6. Step 6: Final answer
   x = 19,795.03