Finding the Fourth Proportional to 57,712, 79,642.72 and 31,216

Step by Step Solution

1. Step 1: Write the proportion equation
   57,712 : 79,642.72 = 31,216 : x
2. Step 2: Convert to fraction form
   57,712/79,642.72 = 31,216/x
3. Step 3: Cross multiply
   57,712x = 79,642.72 × 31,216
4. Step 4: Simplify right side
   57,712x = 2,486,127,147.52
5. Step 5: Solve for x
   x = 2,486,127,147.52/57,712
6. Step 6: Final answer
   x = 43,078.17