Finding the Fourth Proportional to 42,749.31, 64,130.86 and 13,167.14

Step by Step Solution

1. Step 1: Write the proportion equation
   42,749.31 : 64,130.86 = 13,167.14 : x
2. Step 2: Convert to fraction form
   42,749.31/64,130.86 = 13,167.14/x
3. Step 3: Cross multiply
   42,749.31x = 64,130.86 × 13,167.14
4. Step 4: Simplify right side
   42,749.31x = 844,419,691.29
5. Step 5: Solve for x
   x = 844,419,691.29/42,749.31
6. Step 6: Final answer
   x = 19,752.83