Finding the Fourth Proportional to 42,756.20, 64,141.32 and 13,174.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,756.20 : 64,141.32 = 13,174.04 : x
2. Step 2: Convert to fraction form
   42,756.20/64,141.32 = 13,174.04/x
3. Step 3: Cross multiply
   42,756.20x = 64,141.32 × 13,174.04
4. Step 4: Simplify right side
   42,756.20x = 845,000,315.33
5. Step 5: Solve for x
   x = 845,000,315.33/42,756.20
6. Step 6: Final answer
   x = 19,763.22