Finding the Fourth Proportional to 42,748.08, 64,136.52 and 13,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,748.08 : 64,136.52 = 13,164.72 : x
2. Step 2: Convert to fraction form
   42,748.08/64,136.52 = 13,164.72/x
3. Step 3: Cross multiply
   42,748.08x = 64,136.52 × 13,164.72
4. Step 4: Simplify right side
   42,748.08x = 844,339,327.57
5. Step 5: Solve for x
   x = 844,339,327.57/42,748.08
6. Step 6: Final answer
   x = 19,751.51