Finding the Fourth Proportional to 42,765.42, 64,144.03 and 13,175.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,765.42 : 64,144.03 = 13,175.31 : x
2. Step 2: Convert to fraction form
   42,765.42/64,144.03 = 13,175.31/x
3. Step 3: Cross multiply
   42,765.42x = 64,144.03 × 13,175.31
4. Step 4: Simplify right side
   42,765.42x = 845,117,314.34
5. Step 5: Solve for x
   x = 845,117,314.34/42,765.42
6. Step 6: Final answer
   x = 19,761.70