Finding the Fourth Proportional to 42,749.08, 64,138.02 and 13,165.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,749.08 : 64,138.02 = 13,165.72 : x
2. Step 2: Convert to fraction form
   42,749.08/64,138.02 = 13,165.72/x
3. Step 3: Cross multiply
   42,749.08x = 64,138.02 × 13,165.72
4. Step 4: Simplify right side
   42,749.08x = 844,423,212.67
5. Step 5: Solve for x
   x = 844,423,212.67/42,749.08
6. Step 6: Final answer
   x = 19,753.01