Finding the Fourth Proportional to 57,973.72, 86,989.76 and 43,212.28

Step by Step Solution

1. Step 1: Write the proportion equation
   57,973.72 : 86,989.76 = 43,212.28 : x
2. Step 2: Convert to fraction form
   57,973.72/86,989.76 = 43,212.28/x
3. Step 3: Cross multiply
   57,973.72x = 86,989.76 × 43,212.28
4. Step 4: Simplify right side
   57,973.72x = 3,759,025,866.25
5. Step 5: Solve for x
   x = 3,759,025,866.25/57,973.72
6. Step 6: Final answer
   x = 64,840.17