Finding the Fourth Proportional to 42,761.48, 64,148.25 and 13,181.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,761.48 : 64,148.25 = 13,181.72 : x
2. Step 2: Convert to fraction form
   42,761.48/64,148.25 = 13,181.72/x
3. Step 3: Cross multiply
   42,761.48x = 64,148.25 × 13,181.72
4. Step 4: Simplify right side
   42,761.48x = 845,584,269.99
5. Step 5: Solve for x
   x = 845,584,269.99/42,761.48
6. Step 6: Final answer
   x = 19,774.44