Finding the Fourth Proportional to 57,636, 79,537.76 and 31,140

Step by Step Solution

1. Step 1: Write the proportion equation
   57,636 : 79,537.76 = 31,140 : x
2. Step 2: Convert to fraction form
   57,636/79,537.76 = 31,140/x
3. Step 3: Cross multiply
   57,636x = 79,537.76 × 31,140
4. Step 4: Simplify right side
   57,636x = 2,476,805,846.40
5. Step 5: Solve for x
   x = 2,476,805,846.40/57,636
6. Step 6: Final answer
   x = 42,973.24